import React from "react";
import ReactDOM from "react-dom/client";

function Hello(props) {
  return <h1>Hello World!</h1>;

ReactDOM.render(<Hello />, document.getElementById("root"));

The examples in this tutorial are created using the

Install the create-react-app,
and you will be able to run the same examples on your computer.

In this example we create a component called 'Hello'.
The component is rendered in a container called 'root'.