What is the simplest thing I can do to learn how plugins work?

I am PAINFULLY new to UE. I need to learn how to write plugins or, at the very least, how they work. I have loads of C++ experience and can pick up quickly if I have a clue. I would like to see the simplest thing I can to get started. Is there a video or online tutorial that takes you into it and says “this connects to this and doing this will show up here and then you can wire it up thusly” or something to that effect? Suggestions?

Thanks!

Thank you. I will give those a look!

Looks like one of:

or