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ReactIntermediate#forms
ReactBeginner#props#state
Difference between props and state?
Props are read-only inputs passed from the parent and make a component reusable. State is data owned and mutated by the component itself; updating it re-renders the component.
Example
function Counter({ step }) { // prop
const [n, setN] = useState(0); // state
return <button onClick={() => setN(n + step)}>{n}</button>;
}