ReactPro is a comprehensive learning app on Google Play Store designed for React.js enthusiasts, from beginners to advanced users. It offers step-by-step tutorials covering core concepts like components, state, props, and hooks, advancing to topics such as context API, performance optimization. ReactPro’s user-friendly interface and structured courses make it an ideal resource for mastering React.js on the go.

Here’s list of topics of this React.js tutorial:

1. Introduction to React
- What is React?
- Key features of React (Components, JSX, Virtual DOM)
- Installing React (Create React App)

2. JSX: JavaScript XML
- JSX syntax and usage
- Embedding expressions in JSX
- Rendering JSX

3. Components in React
- Functional vs Class components
- Creating and rendering components
- Component structure and reusability

4. Props
- Passing data to components using props
- Prop validation
- Default props

5. State and Lifecycle
- Managing component state with `useState`
- Updating state
- Understanding lifecycle methods (for class components) and hooks (like `useEffect`)

6. Handling Events
- Adding event listeners
- Handling user input and events
- Binding event handlers

7. Conditional Rendering
- Rendering elements conditionally
- Using if/else statements and ternary operators in JSX

8. Lists and Keys
- Rendering lists in React
- Using the `map()` function to display dynamic content
- Importance of keys in React lists

9. Forms in React
- Controlled vs Uncontrolled components
- Handling form inputs
- Form submission and validation

10. Lifting State Up
- Sharing state between components
- Lifting state up to a common ancestor

11. React Router
- Setting up React Router for navigation
- Defining routes and links
- Nested routes and route parameters

12. Hooks Overview
- Introduction to React hooks
- Common hooks: `useState`, `useEffect`, `useContext`
- Custom hooks (optional)

13. Styling in React
- Inline styling
- CSS stylesheets and modules
- CSS-in-JS libraries (e.g., styled-components)

14. Basic Debugging and Developer Tools
- Using React Developer Tools
- Debugging common errors

15. Deploying a React App
- Building the app for production
- Deployment options (Netlify, Vercel, GitHub Pages)

This would cover the foundational concepts and get someone started with React!

Advanced topics :
16. Context API and State Management
- Understanding React Context API
- Using Context to avoid prop drilling
- Context vs. state management libraries (Redux, MobX)
- When and why to use state management libraries

17. Advanced Hooks
- Detailed look at `useReducer` for complex state management
- Using `useMemo` and `useCallback` for performance optimization
- Understanding and using `useRef` for DOM manipulation and persistence
- Creating custom hooks to encapsulate reusable logic

18. Higher-Order Components (HOC)
- Understanding Higher-Order Components
- Creating HOCs to enhance functionality
- Use cases and best practices
- Comparison with Render Props

19. Render Props Pattern
- What are Render Props?
- Creating and using components with render props
- When to use render props vs HOCs

20. Error Boundaries
- Understanding Error Boundaries in React
- Implementing error boundaries using `componentDidCatch`
- Error handling best practices in React

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