If you have done any scripting at all in the past you can get lua basics in an hour using google . I found this most useful:
https://www.lua.org/manual/5.1/manual.html
The tricky part will be using the api, documentation will be the key or the killer depending how bad it goes, i'm expecting that not to be priority for some time.
I've not touched C in 25 years, but am finding playing with c# in space engineers very satisfying, I'm quite thick but even I have managed to do some nice things.
this is a nice bit of fun too
https://codecombat.com/play/dungeon
Also World of warcraft uses lau and I made a few addons for myself years ago. WOW is free to play these days and google "lua wow addon tutorial" brings up a few option,