I was on Facebook and saw a link I liked so I hit the share button and was given a few choices, one of which was to copy the link. I hit that choice but don’t know where on my iPad to find it. Where is it copied too?
Anything you copy on the iPad (link or otherwise) is saved onto the clipboard, much as it does on a desktop computer. You can't normally see it while it's there, but you can paste it into another document. For example, if you wanted to include the sharing link in an email you would:
Click share and choose "copy link".
Switch to your email app and write your message.
At the point where you want to insert the link, give the screen a long tap and choose "paste" from the menu.