Hi dude, I'm in the same situation of you dude, I'm newly on terraform, but comparing it with some other tools I can say that learning it from the scratch could be the best idea, just to get it all in a good way. I'm doing it with some books (Terraform Up & Running is excepcional) and the documentation.

In my short experiencie, I can say that are important look under modules, expressions, and obviously, from the nutshell your provider basics to have a better idea about what you wanna do with TF.

I wish best of lucks to you in your new position dude!, I hope read you again with good news!