React 시작.

💻 MacBook Air (M1) 베이스 👨🏻‍💻.

1. Node.js 설치.
   brew install node

2. Parent Directory에서 create-react-app. 나의 경우에는 앱 이름이 'grass-roots'.
   npx create-react-app grass-roots

3. 앱 실행.
   npm start

4. react-router-dom 설치.
   npm install react-router-dom

• 배운 것.

import React, { useState } from "react";
import { BrowserRouter as Router,
        Switch,
        Route,
        Link } from "react-router-dom";