Web Development - HTML, CSS & JavaScript
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Learn to code and become a Web Developer with HTML, CSS, JavaScript , Reactjs, Wordpress, PHP, Mern & Nodejs knowledge

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⌨️ Useful CSS grid cheat sheet

You’ve seen this many times. But practice makes perfect, right?
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7 Most Popular Programming Languages in 2025

1. Python

The Jack of All Trades

Why it's loved: Simple syntax, huge community, beginner-friendly.

Used for: Data Science, Machine Learning, Web Development, Automation.

Who uses it: Data analysts, backend developers, researchers, even kids learning to code.


2. JavaScript

The Language of the Web

Why it's everywhere: Runs in every browser, now also on servers (Node.js).

Used for: Frontend & backend web apps, interactive UI, full-stack apps.

Who uses it: Web developers, app developers, UI/UX enthusiasts.


3. Java

The Enterprise Backbone

Why it stands strong: Portable, secure, scalable β€” runs on everything from desktops to Android devices.

Used for: Android apps, enterprise software, backend systems.

Who uses it: Large corporations, Android developers, system architects.


4. C/C++

The Power Players

Why they matter: Super fast, close to the hardware, great for performance-critical apps.

Used for: Game engines, operating systems, embedded systems.

Who uses it: System programmers, game developers, performance-focused engineers.


5. C#

Microsoft’s Darling

Why it's growing: Built into the .NET ecosystem, great for Windows apps and games.

Used for: Desktop applications, Unity game development, enterprise tools.

Who uses it: Game developers, enterprise app developers, Windows lovers.


6. SQL

The Language of Data

Why it’s essential: Every application needs a database β€” SQL helps you talk to it.

Used for: Querying databases, reporting, analytics.

Who uses it: Data analysts, backend devs, business intelligence professionals.


7. Go (Golang)

The Modern Minimalist

Why it’s rising: Simple, fast, and built for scale β€” ideal for cloud-native apps.

Used for: Web servers, microservices, distributed systems.

Who uses it: Backend engineers, DevOps, cloud developers.

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You can learn ReactJS easily 🀩

Here's all you need to get started πŸ™Œ

1.Components
β€’ Functional Components
β€’ Class Components
β€’ JSX (JavaScript XML) Syntax

2.Props (Properties)
β€’ Passing Props
β€’ Default Props
β€’ Prop Types

3.State
β€’ useState Hook
β€’ Class Component State
β€’ Immutable State

4.Lifecycle Methods (Class Components)
β€’ componentDidMount
β€’ componentDidUpdate
β€’ componentWillUnmount

5.Hooks (Functional Components)
β€’ useState
β€’ useEffect
β€’ useContext
β€’ useReducer
β€’ useCallback
β€’ useMemo
β€’ useRef
β€’ useImperativeHandle
β€’ useLayoutEffect

6.Event Handling
β€’ Handling Events in Functional Components
β€’ Handling Events in Class Components

7.Conditional Rendering
β€’ if Statements
β€’ Ternary Operators
β€’ Logical && Operator

8.Lists and Keys
β€’ Rendering Lists
β€’ Keys in React Lists

9.Component Composition
β€’ Reusing Components
β€’ Children Props
β€’ Composition vs Inheritance

10.Higher-Order Components (HOC)
β€’ Creating HOCs
β€’ Using HOCs for Reusability

11.Render Props
β€’ Using Render Props Pattern

12.React Router
β€’ <BrowserRouter>
β€’ <Route>
β€’ <Link>
β€’ <Switch>
β€’ Route Parameters

13.Navigation
β€’ useHistory Hook
β€’ useLocation Hook

State Management

14.Context API
β€’ Creating Context
β€’ useContext Hook

15.Redux
β€’ Actions
β€’ Reducers
β€’ Store
β€’ connect Function (React-Redux)

16.Forms
β€’ Handling Form Data
β€’ Controlled Components
β€’ Uncontrolled Components

17.Side Effects
β€’ useEffect for Data Fetching
β€’ useEffect Cleanup

18.AJAX Requests
β€’ Fetch API
β€’ Axios Library

Error Handling

19.Error Boundaries
β€’ componentDidCatch (Class Components)
β€’ ErrorBoundary Component (Functional
Components)

20.Testing
β€’ Jest Testing Framework
β€’ React Testing Library

21. Best Practices
β€’ Code Splitting
β€’ PureComponent and React.iss.onemo
β€’ Avoiding Reconciliation
β€’ Keys for Dynamic Lists

22.Optimization
β€’ Memoization
β€’ Profiling and Performance Monitoring

23. Build and Deployment
β€’ Create React App (CRA)
β€’ Production Builds
β€’ Deployment Strategies

Frameworks and Libraries

24.Styling Libraries
β€’ Styled-components
β€’ CSS Modules

25.State Management Libraries
β€’ Redux
β€’ MobX

26.Routing Libraries
β€’ React Router
β€’ Reach Router

React ❀️ for more

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Python Interview Questions with Answers
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preventDefault() vs stopPropagation() vs stopImmediatePropagation()

When to Use What:

πŸ“ŒpreventDefault(): When you want to handle the action yourself

πŸ“Œ stopPropagation(): When parent elements shouldn't react

πŸ“Œ stopImmediatePropagation(): Nuclear option for plugin conflicts

90% of the time, you only need preventDefault().
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DSA Handwritten Notes
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