Even though I look up a million things a day, I kept forgetting to look up a very simple phrase that would have saved me so much time!!!
I am posting the information here in case it helps others.
I was getting a strange error code any time I tried to empty Trash. I looked up that error code and there was nothing available to help me.
Today I finally looked up “fix trash on mac” and found this:
Have you encountered the occasional OS X problem and the inability to empty your Mac’s Trash? There are numerous tricks for forcing the Mac to empty the Trash, but if all fails there is one last method.
Probably the simplest way to fix a problem with Trash is simply to do a reboot, however many times that won’t solve the problem, so you’ll have to try opening Trash in Finder and hold down the Option key while clicking the Empty button.
This is what finally worked for me and now my Trash is finally empty and the space is restored on my drive.

