How to get job as a python fresher?

1. Get Your Python Fundamentals Strong
You should have a clear understanding of Python syntax, statements, variables & operators, control structures, functions & modules, OOP concepts, exception handling, and various other concepts before going out for a Python interview.

2. Learn Python Frameworks
As a beginner, you’re recommended to start with Django as it is considered the standard framework for Python by many developers. An adequate amount of experience with frameworks will not only help you to dive deeper into the Python world but will also help you to stand out among other Python freshers.

3. Build Some Relevant Projects
You can start it by building several minor projects such as the Number guessing game, Hangman Game, Website Blocker, and many others. Also, you can opt to build few advanced-level projects once you’ll learn several Python web frameworks and other trending technologies.

4. Get Exposure to Trending Technologies Using Python
Python is being used with almost every latest tech trend whether it be Artificial Intelligence, Internet of Things (IoT), Cloud Computing, or any other. And getting exposure to these upcoming technologies using Python will not only make you industry-ready but will also give you an edge over others during a career opportunity.

5. Do an Internship & Grow Your Network
You need to connect with those professionals who are already working in the same industry in which you are aspiring to get into such as Data Science, Machine learning, Web Development, etc.

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100+ Practice Questions✅👩‍💻

❍ C/C++
❍ Python
❍ JavaScript
❍ Java
❍ C#
❍ Golang

➊ Simple Numbers

➀ Find a digit at a specific place in a number
➁ Find count of digits in a number
➂ Find the largest digit
➃ Find the 2nd largest digit
➄ Find the kth largest digit
➅ Find the smallest digit
➆ Find the 2nd smallest digit
➇ Find the kth smallest digit
➈ Find generic root (sum of all digits) of a number
➉ Reverse the digits in a number
➀➀ Rotate the digits in a number
➀➁ Is the number a palindrome?
➀➂ Find sum of 'n' numbers
➀➃ Check if a number is perfect square
➀➄ Find a number in an AP sequence
➀➅ Find a number in a GP sequence
➀➆ Find a number in fibonacci sequence
➀➇ Check number divisibility by 2, 3, 5, 9
➀➈ Check if a number is primary or not
20. Given a number, print all primes smaller than it
➁➀ Check if a number is circular prime or not
➁➁ Find all prime factors of a number
➁➂ Find the GCD of 2 numbers
➁➃ Find the LCM of 2 numbers
➁➄ Find the factorial of a number
➁➅ Find the exponentiation of a number

➋ Unit Conversion

➀ Number Base (Binary, Octal, Hexadecimal, Decimal)
➁ Weight (gram, kg, pound)
➂ Height (cm, m, inch, feet)
➃ Temperature (centigrade, fahrenhite)
➄ Distance (km, mile)
➅ Area (m², km², acre)
➆ Volume (ltr, gallon)
➇ Time (sec, min, hour)
➈ Currency

➌ Calculator

➀ Loan EMI Calculator
➁ Fixed Deposit Returns Calculator
➂ Interest Calculator
➃ BMI Calculator
➄ Item Price (considering tax, discount, shipping)
➅ Tip Calculator

➍ Geometry

➀ Find distance between 2 points
➁ Given 2 sides of a right angle triangle, find the 3rd
➂ Find 3rd angle of a triangle when 2 are given
➃ Area of a triangle when 3 sides are given
➄ Area of a right angle triangle
➅ Perimeter of a Square
➆ Area of a Square
➇ Perimeter of a Rectangle
➈ Area of a Rectangle
➉ Circumference of a Circle
➀➀ Area of a Circle
➀➁ Circumference of a Semi-Circle
➀➂ Area of a Semi-Circle
➀➃ Area of a Ring
➀➄ Circumference of an Ellipse
➀➅ Area of an Ellipse
➀➆ Suface Area of a Sphere
➀➇ Volume of a Sphere
➀➈ Surface Area of a Hemisphere
20. Volume of a Hemisphere
➁➀ Surface area of a Cube
➁➁ Volume of a Cube
➁➂ Surface area of a Cylinder
➁➃ Volume of a Cylinder

➎ Vector

➀ Find Scalar Multiplication of a vector
➁ Find addition/subtraction of vectors
➂ Find magnitude of a vector
➃ Find an unit vector along a given vector
➄ Find dot product of 2 vectors
➅ Find cross product of 2 vectors
➆ Check if 2 vectors are orthogonal

➏ Matrix

➀ Find the determinant of a matrix
➁ Find Scalar Multiplication of a matrix
➂ Find addition/subtraction of matrices
➃ Find the transpose of a matrix
➄ Find if 2 matrices are orthogonal
➅ Find inverse of a 2x2 and 3x3 matrix

➐ Set

➀ Find Union of 2 sets
➁ Find Intersection of 2 sets
➂ Find the Difference of 2 sets
➃ Find the Symmetric Difference of 2 sets
➄ Find if a set is subset/superset of another set
➅ Find if 2 sets are disjoints

➑ Special Numbers

➀ Strong Number
➁ Perfect Number
➂ Armstrong Number
➃ Harshad Number
➄ Kaprekar Number
➅ Lychrel Number
➆ Narcissistic Decimal Number
➇ Lucus Number
➈ Catalan Number
➉ Duck Number
➀➀ Ugly Number
➀➁ Abundant Number
➀➂ Deficient Number
➀➃ Automorphic Number
➀➄ Magic Number
➀➅ Friendly Pair Numbers
➀➆ Neon Number
➀➇ Spy Number
➀➈ Happy Number
20. Sunny Number
➁➀ Disarium Number
➁➁ Pronic Number
➁➂ Trimorphic Number
➁➃ Evil Number
➁➄ Amicable Pairs

⬘ If you want to excel in programming, practice a lot.

⬙ Problems based on numbers are easy to start with and they help in improving your analytical skills.

Complete DSA Roadmap 🎯

|-- Basic_Data_Structures
| |-- Arrays
| |-- Strings
| |-- Linked_Lists
| |-- Stacks
| └─ Queues
|
|-- Advanced_Data_Structures
| |-- Trees
| | |-- Binary_Trees
| | |-- Binary_Search_Trees
| | |-- AVL_Trees
| | └─ B-Trees
| |
| |-- Graphs
| | |-- Graph_Representation
| | | |- Adjacency_Matrix
| | | └ Adjacency_List
| | |
| | |-- Depth-First_Search
| | |-- Breadth-First_Search
| | |-- Shortest_Path_Algorithms
| | | |- Dijkstra's_Algorithm
| | | └ Bellman-Ford_Algorithm
| | |
| | └─ Minimum_Spanning_Tree
| | |- Prim's_Algorithm
| | └ Kruskal's_Algorithm
| |
| |-- Heaps
| | |-- Min_Heap
| | |-- Max_Heap
| | └─ Heap_Sort
| |
| |-- Hash_Tables
| |-- Disjoint_Set_Union
| |-- Trie
| |-- Segment_Tree
| └─ Fenwick_Tree
|
|-- Algorithmic_Paradigms
| |-- Brute_Force
| |-- Divide_and_Conquer
| |-- Greedy_Algorithms
| |-- Dynamic_Programming
| |-- Backtracking
| |-- Sliding_Window_Technique
| |-- Two_Pointer_Technique
| └─ Divide_and_Conquer_Optimization
| |-- Merge_Sort_Tree
| └─ Persistent_Segment_Tree
|
|-- Searching_Algorithms
| |-- Linear_Search
| |-- Binary_Search
| |-- Depth-First_Search
| └─ Breadth-First_Search
|
|-- Sorting_Algorithms
| |-- Bubble_Sort
| |-- Selection_Sort
| |-- Insertion_Sort
| |-- Merge_Sort
| |-- Quick_Sort
| └─ Heap_Sort
|
|-- Graph_Algorithms
| |-- Depth-First_Search
| |-- Breadth-First_Search
| |-- Topological_Sort
| |-- Strongly_Connected_Components
| └─ Articulation_Points_and_Bridges
|
|-- Dynamic_Programming
| |-- Introduction_to_DP
| |-- Fibonacci_Series_using_DP
| |-- Longest_Common_Subsequence
| |-- Longest_Increasing_Subsequence
| |-- Knapsack_Problem
| |-- Matrix_Chain_Multiplication
| └─ Dynamic_Programming_on_Trees
|
|-- Mathematical_and_Bit_Manipulation_Algorithms
| |-- Prime_Numbers_and_Sieve_of_Eratosthenes
| |-- Greatest_Common_Divisor
| |-- Least_Common_Multiple
| |-- Modular_Arithmetic
| └─ Bit_Manipulation_Tricks
|
|-- Advanced_Topics
| |-- Trie-based_Algorithms
| | |-- Auto-completion
| | └─ Spell_Checker
| |
| |-- Suffix_Trees_and_Arrays
| |-- Computational_Geometry
| |-- Number_Theory
| | |-- Euler's_Totient_Function
| | └─ Mobius_Function
| |
| └─ String_Algorithms
| |-- KMP_Algorithm
| └─ Rabin-Karp_Algorithm
|
|-- OnlinePlatforms
| |-- LeetCode
| |-- HackerRank

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Here are the 50 JavaScript interview questions for 2024

1. What is JavaScript?
2. What are the data types in JavaScript?
3. What is the difference between null and undefined?
4. Explain the concept of hoisting in JavaScript.
5. What is a closure in JavaScript?
6. What is the difference between “==” and “===” operators in JavaScript?
7. Explain the concept of prototypal inheritance in JavaScript.
8. What are the different ways to define a function in JavaScript?
9. How does event delegation work in JavaScript?
10. What is the purpose of the “this” keyword in JavaScript?
11. What are the different ways to create objects in JavaScript?
12. Explain the concept of callback functions in JavaScript.
13. What is event bubbling and event capturing in JavaScript?
14. What is the purpose of the “bind” method in JavaScript?
15. Explain the concept of AJAX in JavaScript.
16. What is the “typeof” operator used for?
17. How does JavaScript handle errors and exceptions?
18. Explain the concept of event-driven programming in JavaScript.
19. What is the purpose of the “async” and “await” keywords in JavaScript?
20. What is the difference between a deep copy and a shallow copy in JavaScript?
21. How does JavaScript handle memory management?
22. Explain the concept of event loop in JavaScript.
23. What is the purpose of the “map” method in JavaScript?
24. What is a promise in JavaScript?
25. How do you handle errors in promises?
26. Explain the concept of currying in JavaScript.
27. What is the purpose of the “reduce” method in JavaScript?
28. What is the difference between “null” and “undefined” in JavaScript?
29. What are the different types of loops in JavaScript?
30. What is the difference between “let,” “const,” and “var” in JavaScript?
31. Explain the concept of event propagation in JavaScript.
32. What are the different ways to manipulate the DOM in JavaScript?
33. What is the purpose of the “localStorage” and “sessionStorage” objects?
34. How do you handle asynchronous operations in JavaScript?
35. What is the purpose of the “forEach” method in JavaScript?
36. What are the differences between “let” and “var” in JavaScript?
37. Explain the concept of memoization in JavaScript.
38. What is the purpose of the “splice” method in JavaScript arrays?
39. What is a generator function in JavaScript?
40. How does JavaScript handle variable scoping?
41. What is the purpose of the “split” method in JavaScript?
42. What is the difference between a deep clone and a shallow clone of an object?
43. Explain the concept of the event delegation pattern.
44. What are the differences between JavaScript’s “null” and “undefined”?
45. What is the purpose of the “arguments” object in JavaScript?
46. What are the different ways to define methods in JavaScript objects?
47. Explain the concept of memoization and its benefits.
48. What is the difference between “slice” and “splice” in JavaScript arrays?
49. What is the purpose of the “apply” and “call” methods in JavaScript?
50. Explain the concept of the event loop in JavaScript and how it handles asynchronous operations.

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Top coding interview questions & answers Part-1 👇👇

1. What is the difference between a stack and a queue?
A stack is a data structure that follows the Last-In-First-Out (LIFO) principle, meaning that the last element added is the first one to be removed. A queue, on the other hand, follows the First-In-First-Out (FIFO) principle, where the first element added is the first one to be removed.

2. Explain the concept of recursion.
Recursion is a programming technique where a function calls itself to solve a problem. It involves breaking down a complex problem into smaller sub-problems until a base case is reached, which allows the function to stop calling itself and start returning values.

3. What is the time complexity of various sorting algorithms?
Some common sorting algorithms and their time complexities are:
- Bubble Sort: O(n^2)
- Insertion Sort: O(n^2)
- Selection Sort: O(n^2)
- Merge Sort: O(n log n)
- Quick Sort: O(n log n)
- Heap Sort: O(n log n)

4. What is the difference between an abstract class and an interface?
An abstract class can have both implemented and unimplemented methods, while an interface can only have unimplemented methods. A class can extend only one abstract class but can implement multiple interfaces.

5. What is the difference between a deep copy and a shallow copy?
A shallow copy creates a new object that references the same memory locations as the original object, while a deep copy creates a new object with its own memory and copies the values from the original object.

6. Explain the concept of polymorphism.
Polymorphism is the ability of an object to take on many forms. It allows objects of different classes to be treated as objects of a common superclass. This enables code to be written that can work with objects of different classes, as long as they share a common interface or superclass.

7. What is the difference between an instance variable and a static variable?
An instance variable belongs to an instance of a class and has separate copies for each instance. A static variable, on the other hand, belongs to the class itself and is shared by all instances of that class.

8. How does garbage collection work in Java?
Garbage collection in Java automatically frees up memory by deallocating objects that are no longer reachable or in use. The Java Virtual Machine (JVM) keeps track of all objects and their references, and periodically identifies and removes objects that are no longer needed.

9. Explain the concept of encapsulation.
Encapsulation is the practice of hiding internal details of an object and providing access to its functionality through well-defined interfaces. It helps in achieving data abstraction, data hiding, and code modularity.

10. What is the difference between a linked list and an array?
An array is a fixed-size data structure that stores elements in contiguous memory locations, allowing for random access using indices. A linked list, on the other hand, is a dynamic data structure where elements are stored in separate nodes that contain references to the next node, allowing for efficient insertion and deletion but slower random access.

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Top coding interview questions & answers Part-2 👇👇

11. What is the difference between an instance method and a static method?
An instance method operates on an instance of a class and can access instance variables and methods. A static method belongs to the class itself and can only access static variables and methods.

12. Explain the concept of inheritance.
Inheritance is a mechanism in object-oriented programming where one class inherits properties and behaviors from another class. The class being inherited from is called the superclass or base class, while the class inheriting is called the subclass or derived class. Inheritance allows for code reuse and promotes code organization.

13. What is the difference between stack memory and heap memory?
Stack memory is used for storing local variables and function calls, while heap memory is used for dynamically allocated memory using keywords like "new" or "malloc". Stack memory is managed by the compiler, while heap memory must be managed manually by the programmer.

14. What is a hashtable and how does it work?
A hash table (or hash map) is a data structure that allows for efficient insertion, deletion, and retrieval of key-value pairs. It uses a hash function to map keys to an index in an array, where values are stored. Collisions can occur when multiple keys map to the same index, which can be resolved using techniques like chaining or open addressing.

15. Explain the concept of deadlock.
Deadlock occurs when two or more processes are unable to proceed because each is waiting for a resource held by another process, resulting in a circular dependency. Deadlocks can be prevented by using techniques like resource allocation graphs, deadlock avoidance algorithms, or by implementing mechanisms like locks or semaphores.

16. What are some advantages of using object-oriented programming?
Advantages of object-oriented programming include code reusability, modularity, encapsulation, easier maintenance and debugging, improved code organization, and increased productivity through abstraction and polymorphism.

17. What is dynamic programming?
Dynamic programming is an algorithmic technique where complex problems are broken down into simpler overlapping subproblems, which are solved once and their solutions are stored for future reference. This technique helps avoid redundant computations and improves efficiency.

18. How does binary search work?
Binary search is an efficient algorithm for finding a target value within a sorted array. It compares the target value with the middle element of the array and narrows down the search space by half with each comparison until the target value is found or determined to be absent.

19. What are some common data structures used in computer science?
Some common data structures include arrays, linked lists, stacks, queues, trees (binary trees, AVL trees, etc.), heaps, hash tables, graphs, and sets.

20. Explain the concept of Big O notation.
Big O notation is used to describe the performance or complexity of an algorithm in terms of its input size. It represents the upper bound or worst-case scenario of an algorithm's time or space complexity. For example, O(1) represents constant time complexity, O(n) represents linear time complexity, O(n^2) represents quadratic time complexity, etc.

Top 10 Python Interview Questions

1. What is Python and what are its key features?
Python is a high-level, interpreted programming language known for its simplicity and readability. Its key features include dynamic typing, automatic memory management, a large standard library, and support for multiple programming paradigms (such as procedural, object-oriented, and functional programming).

2. What are the differences between Python 2 and Python 3?
Python 2 and Python 3 are two major versions of the Python programming language. Some key differences include:
- Python 3 has stricter syntax rules and is not backward compatible with Python 2.
- Python 3 has improved Unicode support and better handling of byte strings.
- Python 3 has some new features and improvements over Python 2, such as the print function being replaced by the print() function.

3. Explain the difference between list and tuple in Python.
- Lists are mutable, meaning their elements can be changed after creation, while tuples are immutable and their elements cannot be changed.
- Lists are defined using square brackets [], while tuples are defined using parentheses ().
- Lists are typically used for collections of items that may need to be modified, while tuples are used for fixed collections of items that should not change.

4. What is PEP 8 and why is it important?
PEP 8 is the official style guide for Python code, outlining best practices for writing clean, readable, and maintainable code. Following PEP 8 helps ensure consistency across projects, makes code easier to understand and maintain, and promotes good coding habits within the Python community.

5. How do you handle exceptions in Python?
Exceptions in Python can be handled using try-except blocks. The code that may raise an exception is placed within the try block, and any potential exceptions are caught and handled in the except block. Additionally, you can use the finally block to execute cleanup code regardless of whether an exception occurs.

6. What is a decorator in Python and how do you use it?
A decorator in Python is a function that takes another function as input and extends or modifies its behavior without changing its source code. Decorators are typically used to add functionality to functions or methods, such as logging, authentication, or performance monitoring. To use a decorator, you simply place the "@decorator_name" above the function definition.

7. Explain the difference between '==' and 'is' in Python.
The '==' operator checks for equality of values between two objects, while the 'is' operator checks for identity, meaning it compares whether two objects refer to the same memory location. In other words, '==' checks if two objects have the same value, while 'is' checks if they are the same object.

8. How do you create a virtual environment in Python?
You can create a virtual environment in Python using the venv module, which is included in the standard library. To create a virtual environment, you run the command "python -m venv myenv" in your terminal or command prompt, where "myenv" is the name of your virtual environment. You can then activate the virtual environment using the appropriate command for your operating system.

9. What is the difference between a shallow copy and a deep copy in Python?
A shallow copy creates a new object but does not recursively copy nested objects within it, meaning changes to nested objects will affect both the original and copied objects. A deep copy creates a new object and recursively copies all nested objects within it, ensuring that changes to nested objects do not affect the original object.

10. How do you handle file I/O operations in Python?
File I/O operations in Python can be performed using built-in functions such as open(), read(), write(), close(), and more. To read from a file, you open it in read mode ('r') and use functions like read() or readline(). To write to a file, you open it in write mode ('w') or append mode ('a') and use functions like write() or writelines().

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Top 10 JavaScript Interview Questions

1. What is JavaScript and what are its key features?
JavaScript is a high-level, interpreted programming language primarily used for web development. Its key features include being event-driven, prototype-based, dynamically typed, and having first-class functions. It supports functional, object-oriented, and imperative programming styles.

2. What are the differences between JavaScript and Java?
JavaScript is an interpreted language, primarily used for web development to create interactive effects within web browsers. Java, on the other hand, is a compiled, statically-typed programming language used for building applications that run on the Java Virtual Machine (JVM). JavaScript is dynamically typed, whereas Java requires explicit declaration of variable types.

3. Explain the difference between let, var, and const in JavaScript.
- var is function-scoped and can be redeclared and updated.
- let is block-scoped and can be updated but not redeclared within the same scope.
- const is block-scoped and cannot be updated or redeclared, but the properties of objects declared with const can be modified.

4. What is a closure in JavaScript?
A closure is a function that retains access to its lexical scope, even when the function is executed outside that scope. This allows the function to access variables from its defining scope even after that scope has finished executing.

5. How do you handle asynchronous operations in JavaScript?
Asynchronous operations in JavaScript can be handled using callbacks, Promises, or async/await. Callbacks are functions passed as arguments to other functions, Promises represent eventual completion or failure of an asynchronous operation, and async/await allows writing asynchronous code that looks synchronous.

6. What is the Document Object Model (DOM) and how do you manipulate it using JavaScript?
The DOM is a programming interface for HTML and XML documents, representing the structure of a document as a tree of objects. JavaScript can manipulate the DOM using methods like getElementById(), querySelector(), createElement(), and properties like innerHTML and style.

7. Explain the difference between == and === in JavaScript.
The == operator performs type coercion, meaning it converts the operands to the same type before comparing them. The === operator, on the other hand, does not perform type coercion and compares both value and type directly.

8. What is the event loop in JavaScript?
The event loop is a mechanism that allows JavaScript to perform non-blocking, asynchronous operations. It continuously checks the call stack and the message queue. If the call stack is empty, it takes the first event from the message queue and pushes it to the call stack, allowing asynchronous callbacks to be executed.

9. How do you create and use a JavaScript module?
JavaScript modules can be created using the export keyword to export functions, objects, or primitives from a file, and the import keyword to import them into another file. This promotes modular code and reuse of functionality across different parts of an application.

10. How do you handle errors in JavaScript?
Errors in JavaScript can be handled using try-catch blocks. The code that may throw an error is placed in the try block, and any exceptions are caught and handled in the catch block. Additionally, a finally block can be used to execute code regardless of whether an exception occurs.

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This is a great opportunity for people who want to become data analyst

How to prepare for coding interview in 2024 👇👇

1. Master Data Structures and Algorithms: Make sure you have a solid understanding of common data structures (such as arrays, linked lists, trees, graphs, etc.) and algorithms (sorting, searching, dynamic programming, etc.). Practice implementing them in your preferred programming language.

2. Practice Coding Problems: Solve coding problems on platforms like LeetCode, HackerRank, or CodeSignal. Focus on a variety of problem types to improve your problem-solving skills.

3. Review System Design Concepts: Understand the basics of system design principles and practice designing scalable systems. Resources like Grokking the System Design Interview can be helpful.

4. Learn the Latest Technologies: Stay updated with the latest technologies and trends in the industry. Familiarize yourself with popular frameworks, libraries, and tools that are commonly used in software development.

5. Mock Interviews: Practice mock interviews with friends, mentors, or through online platforms to simulate the interview experience. This will help you get comfortable with coding under pressure and receiving feedback.

6. Stay Consistent: Set aside dedicated time each day to practice coding problems and review concepts. Consistency is key to improving your skills over time.

7. Stay Calm and Confident: Remember that interviews are not just about technical skills but also about how you communicate and approach problem-solving. Stay calm, confident, and be prepared to explain your thought process during the interview.

Want to become a software engineer? 🚀 Check out these 5 free courses from Google to get you started! 💻✨

1️⃣ Foundations of Programming: Learn the basics of coding, including variables, operators, control flow, strings, and arrays.
2️⃣ Python: Master one of the most versatile programming languages. Dive into Python basics, lists, strings, sorting, dictionaries, files, regular expressions, and more.
3️⃣ Data Structures & Algorithms: Understand the core of problem-solving. Learn about hashmaps, linked lists, trees, tries, stacks, queues, heaps, graphs, runtime analysis, searching, sorting, recursion, and dynamic programming.
4️⃣ Interview Prep: Get ready for your technical interviews. Learn how to prepare for coding interviews, communicate effectively, and practice with mock interviews.
5️⃣ Software Engineering Principles: Write clean, maintainable code. Cover topics like testing, debugging, working with open-source tools, and design documentation.

From basics to advanced, these courses have got you covered. Let’s make your tech dreams a reality! 🌟👩‍💻👨‍💻

IndiGo Hackathon 2024

Roles Hiring:- Data Scientist & Full Stack Developers

Qualification:- Bachelor’s or Master’s degree 

Experience:- 0 - 3 years

Last Date :- 10th July 2024

Apply Link 👇:-

https://bit.ly/3W5uAeK

Apply before the link expires

Study these 45 problems well and you have prepared for 99% of your System Design Interview:

𝐄𝐚𝐬𝐲
1. Design URL Shortener like TinyURL
2. Design Text Storage Service like Pastebin
3. Design Content Delivery Network (CDN)
4. Design Parking Garage
5. Design Vending Machine
6. Design Distributed Key-Value Store
7. Design Distributed Cache
8. Design Distributed Job Scheduler
9. Design Authentication System
10. Design Unified Payments Interface (UPI)

𝐌𝐞𝐝𝐢𝐮𝐦
11. Design Instagram
12. Design Tinder
13. Design WhatsApp
14. Design Facebook
15. Design Twitter
16. Design Reddit
17. Design Netflix
18. Design Youtube
19. Design Google Search
20. Design E-commerce Store like Amazon
21. Design Spotify
22. Design TikTok
23. Design Shopify
24. Design Airbnb
25. Design Autocomplete for Search Engines
26. Design Rate Limiter
27. Design Distributed Message Queue like Kafka
28. Design Flight Booking System
29. Design Online Code Editor
30. Design Stock Exchange System
31. Design an Analytics Platform (Metrics & Logging)
32. Design Notification Service
33. Design Payment System

𝐇𝐚𝐫𝐝
34. Design Location Based Service like Yelp
35. Design Uber
36. Design Food Delivery App like Doordash
37. Design Google Docs
38. Design Google Maps
39. Design Zoom
40. Design File Sharing System like Dropbox
41. Design Ticket Booking System like BookMyShow
42. Design Distributed Web Crawler
43. Design Code Deployment System
44. Design Distributed Cloud Storage like S3
45. Design Distributed Locking Service

All the best 👍👍