Sorry, it didn’t solve the issue After a lot of googling for 3rd party apps working with Gmail I found a document that said you had to have 2 step authentication turned on first. When I did that it generated a lengthy password to use. Going back into settings on Safari, I went to internet accounts and selected add which brought up the list of choices. My Gmail address was at the top of the list. I tried with that and also selecting Google but both of these went into a blank window with the spinning wheel and the authentication failed again.
I then tried adding it by selecting other. That’s when I got the screen where I could add the one time password and confirm that the incoming mail and outgoing server were configured correctly. It finally loaded my gmail with my other mail accounts. It wasn’t difficult to do but it took forever to find any helpful documentation to point me in the right direction. Thanks for the earlier suggestions!