Step 1

Let's create a React app:

npx create-react-app quicknote-app --use-npm

Delete the default files except for index.html in the public folder. Moreover, remove everything except for App.js and index.js from the src folder. Finally, simplify the remaining files as follows.

index.html 
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>React App</title>
  </head>
  <body>
    <div id="root"></div>
  </body>
</html>
index.js 
import ReactDOM from "react-dom";
import App from "./App";

ReactDOM.render(
  <App />, 
  document.getElementById("root")
);
App.js 
function App() {
  return <div>Hello React!</div>;
}

export default App;