All the technique in the world doesn't compensate for the inability to notice.
Photoshop is useful in many ways but must NEVER be used for the altering of photographs. My assistants and my agency do whatever Photoshop work for me that may be required as it is too complicated for my brain.
You don't study photography, you just do it.
A visual sense is something you either have or you don't.
If you keep your cool, you'll get everything.
I don't really have a favorite camera. I use a Leica and Canon a lot. It depends, especially professionally, on the requirements. But my carry-around camera is a Leica.