A footer is content that appears at the bottom of EVERY page on your Google site.
To add a footer....
Scroll to the bottom of one of your pages.
Click Add footer.
Add the text or content you want to appear at the bottom of every page
e.g. Thank you for viewing my site. Please leave me some feedback.
To edit your footer, scroll to the bottom of the page and then click Edit footer.
To hide the footer on single pages, scroll to the bottom and then click on the eye 👁 icon.
FUN FACT: If you find the SAME content at the bottom of EVERY page, then you have probably accidentally added that content as a footer. You need to delete the footer and then go back and add the content to the page it should be on.