To embed a link to a website (or Google doc) in a Google site, begin by entering text related to the link you wish to create in a text box. Then follow these steps:

1. Select the relevant text.
2. Click on the Insert link icon in the editing toolbar.
3. Copy the URL and paste it in the field provided (use Ctrl+V to paste).
4. Click on Apply.
5. Follow the link to ensure that it works correctly.

Remember to publish your site to display your changes to visitors to your site.