Well, I had a lot of books regarding music theory. I did not really understand any. That changed when I started playing the piano. Suddenly I could hear "Ah, this is that" or "oh, this is how that works". Now, still more beginner than intermediate, I think I would be able to use my DAW or Band in a Box to create little pieces of music on my own. Far from masterpieces, but still ...
As far as teachers go (piano teachers), not all are good, not all are bad. Among the good ones, one needs to find the one that fits best for the individual targets. I found a bad one next door and a very good one on the internet.


“Musicians”: UltraPak 2025
DAW: Studio One Pro +
"Instruments": VSTs and REs
Notation: Notion 6
Interface: NI Komplete Audio 6
Mic: RØDE NT1-A
Controller: Panorama P6/KAWAI VPC1/Atom
OS: Win 10 64 Pro