** Component → Action → Reducer → Store

** Store⇒(useSelector)Component

** Component⇒(useDispatch)Action


# NPM
npm install redux
# react-redux도 설치해야함
npm install react-redux

index.js

import React from "react";
import ReactDOM from "react-dom/client";
import "./index.css";
import App from "./App";
import { Provider } from "react-redux";
import store from "./redux/store";

const root = ReactDOM.createRoot(document.getElementById("root"));
root.render(
  <Provider store={store}>
    <App />
  </Provider>
);