ReactJS has been a dominant force in the web development world for years and shows no signs of losing its popularity. Whether you're a beginner or an experienced developer looking to deepen your knowledge, this step-by-step roadmap will guide you through the essential concepts and advanced techniques in ReactJS.

𝟏.𝐂𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭𝐬
• Functional Components
• Class Components
• JSX (JavaScript XML) Syntax

𝟐.𝐏𝐫𝐨𝐩𝐬 (𝐏𝐫𝐨𝐩𝐞𝐫𝐭𝐢𝐞𝐬)
• Passing Props
• Default Props
• Prop Types

𝟑.𝐒𝐭𝐚𝐭𝐞
• useState Hook
• Class Component State
• Immutable State

𝟒.𝐋𝐢𝐟𝐞𝐜𝐲𝐜𝐥𝐞 𝐌𝐞𝐭𝐡𝐨𝐝𝐬 (𝐂𝐥𝐚𝐬𝐬 𝐂𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭𝐬)
• componentDidMount
• componentDidUpdate
• componentWillUnmount

𝟓.𝐇𝐨𝐨𝐤𝐬 (𝐅𝐮𝐧𝐜𝐭𝐢𝐨𝐧𝐚𝐥 𝐂𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭𝐬)
• useFormStatus - Latest
• useFormState - Latest
• Use - Latest
• useActionState - Latest
• useOptimistic - Latest
• useState
• useEffect
• useContext
• useReducer
• useCallback
• useMemo
• useRef
• useImperativeHandle
• useLayoutEffect

𝟔.𝐄𝐯𝐞𝐧𝐭 𝐇𝐚𝐧𝐝𝐥𝐢𝐧𝐠
• Handling Events in Functional Components
• Handling Events in Class Components

𝟕.𝐂𝐨𝐧𝐝𝐢𝐭𝐢𝐨𝐧𝐚𝐥 𝐑𝐞𝐧𝐝𝐞𝐫𝐢𝐧𝐠
• if Statements
• Ternary Operators
• Logical && Operator

𝟖.𝐋𝐢𝐬𝐭𝐬 𝐚𝐧𝐝 𝐊𝐞𝐲𝐬
• Rendering Lists
• Keys in React Lists

𝟗.𝐂𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭 𝐂𝐨𝐦𝐩𝐨𝐬𝐢𝐭𝐢𝐨𝐧
• Reusing Components
• Children Props
• Composition vs Inheritance

𝟏𝟎.𝐇𝐢𝐠𝐡𝐞𝐫-𝐎𝐫𝐝𝐞𝐫 𝐂𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭𝐬 (𝐇𝐎𝐂)
• Creating HOCs
• Using HOCs for Reusability

𝟏𝟏.𝐑𝐞𝐧𝐝𝐞𝐫 𝐏𝐫𝐨𝐩𝐬
• Using Render Props Pattern

𝟏𝟐.𝐑𝐞𝐚𝐜𝐭 𝐑𝐨𝐮𝐭𝐞𝐫
• BrowserRouter
• Route
• Link
• Routes
• Route Parameters

𝟏𝟑.𝐍𝐚𝐯𝐢𝐠𝐚𝐭𝐢𝐨𝐧
• useHistory Hook
• useLocation Hook

𝐒𝐭𝐚𝐭𝐞 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭

𝟏𝟒.𝐂𝐨𝐧𝐭𝐞𝐱𝐭 𝐀𝐏𝐈
• Creating Context
• useContext Hook

𝟏𝟓.𝐑𝐞𝐝𝐮𝐱
• Actions
• Reducers
• Store
• connect Function (React-Redux)

𝟏𝟔.𝐅𝐨𝐫𝐦𝐬
• Handling Form Data
• Controlled Components
• Uncontrolled Components

𝟏𝟕.𝐒𝐢𝐝𝐞 𝐄𝐟𝐟𝐞𝐜𝐭𝐬
• useEffect for Data Fetching
• useEffect Cleanup

𝟏𝟖.𝐀𝐉𝐀𝐗 𝐑𝐞𝐪𝐮𝐞𝐬𝐭𝐬
• Fetch API
• Axios Library

𝐄𝐫𝐫𝐨𝐫 𝐇𝐚𝐧𝐝𝐥𝐢𝐧𝐠

𝟏𝟗.𝐄𝐫𝐫𝐨𝐫 𝐁𝐨𝐮𝐧𝐝𝐚𝐫𝐢𝐞𝐬
• componentDidCatch (Class Components)
• ErrorBoundary Component (Functional
Components)

𝟐𝟎.𝐓𝐞𝐬𝐭𝐢𝐧𝐠
• Jest Testing Framework
• React Testing Library

𝟐𝟏.𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧
• Memoization
• Profiling and Performance Monitoring

𝟐𝟐. 𝐁𝐮𝐢𝐥𝐝 𝐚𝐧𝐝 𝐃𝐞𝐩𝐥𝐨𝐲𝐦𝐞𝐧𝐭
• Create React App (CRA)
• Production Builds
• Deployment Strategies

𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬 𝐚𝐧𝐝 𝐋𝐢𝐛𝐫𝐚𝐫𝐢𝐞𝐬

𝟐𝟑.𝐒𝐭𝐲𝐥𝐢𝐧𝐠 𝐋𝐢𝐛𝐫𝐚𝐫𝐢𝐞𝐬
• Styled-components
• CSS Modules

𝟐𝟒.𝐒𝐭𝐚𝐭𝐞 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭 𝐋𝐢𝐛𝐫𝐚𝐫𝐢𝐞𝐬
• Redux
• MobX

𝟐𝟔.𝐑𝐨𝐮𝐭𝐢𝐧𝐠 𝐋𝐢𝐛𝐫𝐚𝐫𝐢𝐞𝐬
• React Router
• Reach Router

Conclusion
Mastering ReactJS requires a thorough understanding of its core concepts, advanced features, and associated libraries. This roadmap provides a structured approach to learning and improving your ReactJS skills, ensuring you stay ahead in the ever-evolving web development landscape. Happy coding! 🚀