Lua textbook?
 

Can you recommend any entry level lua textbook that will help me with creating simple addons and read and edit some existing ones.

And btw, can I create some simple windows apps with lua?

Check out this sticky thread at the top of this forum: https://www.wowinterface.com/forums/...ad.php?t=43699

You may be looking for Programming in Lua, the official manual.