I found this playlist of 32 Lua video tutorials.
I know the manual and “how to” books are available on the Lua site, but this is done in more everyday language which is helping me a lot. If you then go to the manual again, it all just makes more sense.
Many Lau resources assume you have some previous scripting or coding experience and brush over subjects that could be pertinent. I particularly like the examples he gives to make the concepts clearer.