I'm in the same boat. The basics of bitcoin script language are pretty easy, the problem I've faced is the special cases and undocumented exceptions. Unfortunately the only way to fully understand scripts your only option is to look at the bitcoin core source code (C++ code), start here.

This answer by me may help you get started on pay to (witness) script hash script types: https://bitcoin.stackexchange.com/a/93733/87716