5 Steps to Learn Front-End Development🚀

Step 1: Basics
— Internet
— HTTP
— Browser
— Domain & Hosting

Step 2: HTML
— Basic Tags
— Semantic HTML
— Forms & Table

Step 3: CSS
— Basics
— CSS Selectors
— Creating Layouts
— Flexbox
— Grid
— Position - Relative & Absolute
— Box Model
— Responsive Web Design

Step 3: JavaScript
— Basics Syntax
— Loops
— Functions
— Data Types & Object
— DOM selectors
— DOM Manipulation
— JS Module - Export & Import
— Spread & Rest Operator
— Asynchronous JavaScript
— Fetching API
— Event Loop
— Prototype
— ES6 Features

Step 4: Git and GitHub
— Basics
— Fork
— Repository
— Pull Repo
— Push Repo
— Locally Work With Git

Step 5: React
— Components & JSX
— List & Keys
— Props & State
— Events
— useState Hook
— CSS Module
— React Router
— Tailwind CSS

Now apply for the job. All the best 🚀
Need Full stack web development course

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Here are the detailed answers to each of the Power BI interview questions that have been asked at Infosys, TCS & Wipro:

1. How can you ensure that Power BI recognizes a specific column as a date column if it doesn't do so automatically?
- You can change the data type of the column in Power Query Editor or in the Data View. Select the column, then use the data type dropdown to select "Date" or "Date/Time."

2. Describe the process Power BI uses to handle large datasets exceeding the in-memory capacity.
- Power BI can handle large datasets by using techniques such as aggregations, incremental refresh, and DirectQuery mode. DirectQuery allows Power BI to query data directly from the source without loading it into memory, while aggregations can summarize data at a higher level to reduce the amount of data processed.

3. Can you explain the role of the Power BI service in the overall Power BI architecture?
- The Power BI service (PowerBI.com) is a cloud-based service that provides various features like sharing, collaboration, and dashboarding. It allows users to publish, share, and manage reports, create dashboards, and collaborate with others in their organization. It also supports data refresh, scheduled refreshes, and gateways to connect to on-premises data sources.

4. What are the key components of data modeling in Power BI?
- The key components of data modeling in Power BI include tables, relationships, measures, calculated columns, and hierarchies. Data modeling involves defining how data from different sources relates to each other and creating a model that supports analysis and reporting.

5. What is the purpose of the VertiPaq engine in Power BI?
- The VertiPaq engine is an in-memory columnar database engine used by Power BI to compress and store data efficiently. It allows for fast query performance by storing data in a highly compressed format and retrieving only the necessary columns for a given query.

6. How do you create a stacked area chart in Power BI?
- To create a stacked area chart, go to the Report View, select the data fields you want to visualize, and then choose the "Stacked Area Chart" option from the visualizations pane.

7. What is the difference between a clustered bar chart and a stacked bar chart?
- A clustered bar chart displays bars for each category grouped side by side, allowing for comparison between categories. A stacked bar chart, on the other hand, stacks the bars on top of each other, showing the total value while also displaying the contribution of each category to the total.

8. Explain the concept of role-based access control (RBAC) in Power BI.
- Role-based access control (RBAC) in Power BI allows administrators to define roles with specific permissions and assign users to these roles. This ensures that users only have access to the data and reports they are authorized to view, enhancing security and data governance.

9. What is a calculated column in Power BI, and how is it different from a measure?
- A calculated column is a column that is created using a DAX formula to add new data to a table in the data model. It is calculated row by row. A measure, however, is a DAX formula used to perform calculations on aggregated data, and its result can change depending on the context of the report or visualization.

10. How can you create and apply a custom data category in Power BI?
- You can create and apply a custom data category by selecting the column in the Data View or Power Query Editor, and then choosing the appropriate data category from the "Modeling" tab in the ribbon. Custom data categories can include geographic data, URLs, and other types.

11. What are the different methods to optimize data load performance in Power BI?
- Methods to optimize data load performance include using DirectQuery mode for real-time queries, reducing the number of columns and rows loaded into memory, using aggregations to summarize data, optimizing data transformations in Power Query, and leveraging incremental refresh for large datasets.

12. Can you outline the Power BI ecosystem and its major components?
- The Power BI ecosystem consists of Power BI Desktop, Power BI Service, Power BI Mobile, Power BI Report Server, and Power BI Embedded. Power BI Desktop is used for creating reports and dashboards, the Power BI Service is a cloud-based platform for sharing and collaboration, Power BI Mobile allows viewing reports on mobile devices, Power BI Report Server is for on-premises report deployment, and Power BI Embedded is for integrating Power BI reports into custom applications.

13. What is the difference between a dataflow and a dataset in Power BI?
- A dataflow is a collection of data transformation processes in Power BI that are reusable and can be shared across multiple reports and datasets. A dataset, on the other hand, is a single source of data created from one or more data sources that is used in Power BI reports and dashboards.

14. How does the DirectQuery mode work in Power BI, and when would you use it?
- DirectQuery mode allows Power BI to directly query the underlying data source in real-time without importing data into memory. This mode is useful when working with very large datasets, ensuring data is always up-to-date, and minimizing the amount of data loaded into memory.

15. How do you create a waterfall chart in Power BI?
- To create a waterfall chart, go to the Report View, select the data fields you want to visualize, and then choose the "Waterfall Chart" option from the visualizations pane. This type of chart shows the cumulative effect of sequential positive and negative values.

16. What are the advantages and disadvantages of using a scatter plot in Power BI?
- Advantages: Scatter plots can show the relationship between two numerical variables, highlight clusters and outliers, and reveal trends and correlations. Disadvantages: They can become cluttered with too many data points, making it hard to interpret, and may require additional context to understand the data fully.

17. Explain the concept of incremental refresh in Power BI.
- Incremental refresh allows Power BI to refresh only the data that has changed or been added since the last refresh, rather than reloading the entire dataset. This reduces the time and resources required for data refreshes, making it suitable for large datasets with frequent updates.

18. What is the purpose of the "Group By" feature in Power BI, and how is it used?
- The "Group By" feature in Power BI allows users to group rows in a table based on one or more columns and perform aggregations (e.g., sum, average) on the grouped data. It is used in the Power Query Editor to simplify and summarize data before loading it into the data model.

19. How can you handle time zone conversions in Power BI?
- Time zone conversions can be handled by using DAX functions to adjust date and time values based on the desired time zone. You can use functions like TIMEZONEOFFSET to calculate the difference between time zones and adjust the datetime values accordingly.

20. What techniques can be used to reduce the file size of a Power BI report?
- Techniques to reduce file size include removing unnecessary columns and rows, using aggregations to summarize data, optimizing data transformations in Power Query, disabling or removing unused visuals, and reducing the number of visuals on a single report page.

21. Describe the different layers involved in Power BI architecture.
- The Power BI architecture consists of the following layers: Data Source Layer (connects to various data sources), Data Transformation Layer (uses Power Query to clean and transform data), Data Modeling Layer (defines relationships, calculated columns, and measures), Visualization Layer (creates reports and dashboards), and Service Layer (manages sharing, collaboration, and data refresh).