**React** is a free open-source Javascript library used for building user interfaces. It is used to build single-page applications. It is easy to learn. To learn it, you must know the basics of **HTML** , **CSS** and **Javascript**.

> ### Below are few useful websites to learn React Js:-
 >1.[https://www.w3schools.com/REACT/DEFAULT.ASP](https://www.w3schools.com/REACT/DEFAULT.ASP)                                                                                               
 >2.[https://www.javatpoint.com/reactjs-tutorial](https://www.javatpoint.com/reactjs-tutorial)                                                                             
 >3.[https://www.tutorialspoint.com/reactjs/index.htm](https://www.tutorialspoint.com/reactjs/index.htm)                                                           
 >4.[https://www.freecodecamp.org/news/react-tutorial-build-a-project/](https://www.freecodecamp.org/news/react-tutorial-build-a-project/)                                                                                
 >5.[https://www.geeksforgeeks.org/reactjs-tutorials/](https://www.geeksforgeeks.org/reactjs-tutorials/)                                                

> ### Below are few useful youtube videos to learn React Js:-
 > 1.[https://www.youtube.com/playlist?list=PLC3y8-rFHvwgg3vaYJgHGnModB54rxOk3](https://www.youtube.com/playlist?list=PLC3y8-rFHvwgg3vaYJgHGnModB54rxOk3)
 > 2.[https://www.youtube.com/watch?v=tiLWCNFzThE&list=PLwGdqUZWnOp3aROg4wypcRhZqJG3ajZWJ](https://www.youtube.com/watch?v=tiLWCNFzThE&list=PLwGdqUZWnOp3aROg4wypcRhZqJG3ajZWJ)
 > 3.[https://www.youtube.com/watch?v=-mJFZp84TIY&list=PLu0W_9lII9agx66oZnT6IyhcMIbUMNMdt](https://www.youtube.com/watch?v=-mJFZp84TIY&list=PLu0W_9lII9agx66oZnT6IyhcMIbUMNMdt)
 > 4.[https://www.youtube.com/watch?v=IcwiDCSWI-Y&list=PLbGui_ZYuhignjLLXTJWkRJKN-SgAqClL](https://www.youtube.com/watch?v=IcwiDCSWI-Y&list=PLbGui_ZYuhignjLLXTJWkRJKN-SgAqClL)                                                                                                                                           
 > 5.[https://www.youtube.com/watch?v=j942wKiXFu8&list=PL4cUxeGkcC9gZD-Tvwfod2gaISzfRiP9d](https://www.youtube.com/watch?v=j942wKiXFu8&list=PL4cUxeGkcC9gZD-Tvwfod2gaISzfRiP9d)

_**Interview Questions coming soon**_

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How to learn React Js

Hooks are the new feature introduced in the React 16.8 version. It allows us to use state and other React features without writing a class. Hooks are the functions which "hook into" React state and lifecycle features from functional components.

> ### Rules of Hooks:-
 >1.Only call Hooks at the top level.                                                                                               
 >2.Only call Hooks inside React functions.

> ### Types of hooks in React:-                                                                                          
 >1.useState: To manage states. Returns a stateful value and an updater function to update it.          
 >2.useEffect: To manage side-effects like API calls, subscriptions, timers, mutations, and more.         
 >3.useContext: To return the current value for a context.                                                                
 >4.useReducer: A useState alternative to help with complex state management.                
 >5.useCallback: It returns a memorized version of a callback to help a child component not re-               render unnecessarily.                                                                                              
 >6.useMemo: It returns a memoized value that helps in performance optimizations.         
 >7.useRef: It returns a ref object with a .current property. The ref object is mutable. 
