In VS Code, you can create multiple cursors in order to insert or delete text at multiple points in a file.
To create multiple cursors in VS Code on Windows or macOS, hold down the Alt key and click in your text editor. To get rid of the multiple cursors, click anywhere in the file again without holding down the Alt key.
Try creating multiple cursors in the index.html file.
Multiple Selections (multi-cursor) from the VS Code Docs