In short
Functions (`useState`, `useEffect`, `useContext`, etc.) that let function components use state, side effects and other React features — the foundation of modern React.
How to learn this
- 1Learn the 'Rules of Hooks' — only call at the top level, only from React functions.
- 2Work through `useState`, `useEffect` and `useRef` one at a time with small examples.
- 3Practice `useEffect`'s dependency array and cleanup function.
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