Introduction to Web Development

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>App</title>
</head>
<body>
<div id="root"></div>
<script src="main.js"></script>
</body>
</html>

function initApp() {
const app = document.getElementById('root');
console.log('Server running on port 3000');
}

import React from 'react';
import { useState, useEffect } from 'react';
const [data, setData] = useState(null);