Learn by doing, boring answer.
Suggested list for diving in to game dev:
- Pick an engine of choice, there are a lot but since you are here why not UE
- Begin one of the course you purchased
- Modify and try out things during the time going though the course
If you get stuck just try google or read documentation. But the main thing is to just begin and try, noone is an expert at the beginning 
The same goes for programming, just select a language and build smaller applications (e.g. todo lists) or clone an existing game.
Good luck!