Show alerts and messages
Handle button clicks
Create games
Validate forms (like checking if a name was entered)
Change content on the page without reloading

🧪Example:
alert("Hello, world!"); // Try this one on your console.

String – Text
👉 "Hello"
Number – Numbers
👉 42, 3.14
Boolean – True or false
👉 true, false
Undefined – A variable that hasn’t been given a value yet
👉 let x;
Null – Intentionally empty
👉 let y = null;

Object – A collection of key-value pairs
👉 { name: "John", age: 25 }
Array – A list of values
👉 [1, 2, 3, 4]
Function – Reusable blocks of code
👉 function greet() { console.log("Hi!") }

Checking Data Types
To check the data type of a certain variable, we use the typeof operator.

// commenting the code itself with a single comment
// let firstName = 'Yared'; single line comment
// let lastName = 'M'; single line comment

/*
  let location = 'AddisAbaba';
  let age = 200;
  let isMarried = false;
  This is a Multiple line comment
*/

let – when the value can change

const – when the value won’t change

✅ Rules for Naming Variables

To create valid variable names, follow these rules:

No starting with numbers

❌ 1name → ❌
✅ name1 → ✅

Only letters, digits, $, and _ are allowed

❌ my-name → ❌
✅ my_name or myName → ✅

Use camelCase (recommended)

✅ userName, totalAmount

No spaces

❌ user name → ❌
✅ userName → ✅

1️⃣ 50 Projects in 50 Days – Boost your frontend skills with daily mini projects!
🔗 github.com/bradtraversy/50projects50days

2️⃣ Django E-commerce – Build a full-featured online store with Django.
🔗 github.com/justdjango/django-ecommerce

3️⃣ JavaScript Quiz App – A sleek and interactive quiz app to test your JS skills!
🔗 github.com/yashcrest/JavaScript-Quiz-App

4️⃣ PHP Auth System – Learn how to create secure login and registration from scratch.
🔗 github.com/MedAziz218/php-authentication-system

5️⃣ To-Do List – A clean and simple productivity app to manage tasks.
🔗 github.com/groundberry/todo-list

Newton… A mind forever voyaging through strange seas of thought… alone.

Whether you're a beginner or planning a career switch, web development is a powerful and rewarding skill set in today’s digital world. 🌐

It’s Google’s AI-powered note-taking and research assistant , designed to help students like 👉🏿 YOU understand and organize complex content faster.

💥 Don't stop when you're tired. Stop when you're done. – David Goggins 💥