This following steps show how changing the content of a file causes the application to reload in the browser:

1. Open a console window.
2. Go to the hello-react folder.
3. Run npm start.
4. Launch a browser and go to http://localhost:3000.
5. Launch a text editor and open the App.js file.
6. Search for the following line of code:

To get started, edit <code>src/App.js</code> and save to reload.

7. Replace the code mentioned in step 6 with the following line of code:

Hello React!

8. Save the file.
9. Check the browser content. Now it should display the new text.