Thank you Mr. Matthew Miller,

I have never heard of a "Compose Key."

      https://en.wikipedia.org/wiki/Compose_key

I try to learn this computering stuff, but I feel like a dog
chasing my tail.

In Gnome 40, the setting is easily found in the Keyboard settings menu
under Settings.

I have been needing this for years.       It might maybe be possible that I once
knew it, but the idea became forgotten to me.

David Locklear