[bil til]

The book "Programming in Lua" is correct.

If you have problems to follow the examples there, then I think best
start with coding exercises in C and Lua, put your level to very low
grade (e. g. 15 kyu or so) and then start with excercises in Codewars
homepage.

There you can do simulation run and you get clear error display and
also correct answers, if you want to see them... .