HOW do I find out when a website was last edited?

To find out when a website was last edited, you can check the page's source code for a "Last-Modified" HTTP header by using browser developer tools. Additionally, some websites display a timestamp at the bottom of the page indicating the last update. You can also use web archiving services like the Wayback Machine to view previous versions of the site and their dates. Lastly, tools like "PageModified" can help track changes and show the last updated date.