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Install Node.js if you haven't already
Create a folder
Use
    npm init
...to create a project, filling in the answers to the questions it asks.
Install vite, react, and react-dom:
    npm install vite react react-dom
Create an index.html file (below).
Create an index.jsx file with your React code (below).
Modify package.json so the "scripts" section is:
    "scripts": {
        "dev": "vite dev",
        "build": "vite build"
    },
Then run your code in dev mode:
    npm run dev
or build a production package:
    npm run build

index.html:

<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=Edge">
    <title>Example</title>
</head>
<body>
    <div id="root"></div>
    <script type="module" src="./index.jsx"></script>
</body>
</html>

index.jsx:

import React from "react";
import { createRoot } from "react-dom/client";

class App extends React.Component {
    constructor(props) {
        super(props);
    }

    render() {
        return (
            <div>
                <h1>Hello World</h1>
            </div>
        );
    }
}

createRoot(document.getElementById("root")).render(<App />);