This example demonstrates a minimal React application that renders the text “Hello React!” as a large, left-aligned heading. It shows how to initialize a React component tree and mount it to the DOM using `ReactDOM.render`. The code imports `React` and `useState`/`useEffect` hooks from the React library, though only the basic component structure is used. The `index.html` loads React and ReactDOM from CDN, while `bundle.js` contains the compiled JavaScript. Data handling and visualizations are absent; the focus is purely on the starter setup.