Photoshop gods, please show up! !

The great god is gone, and the little devil has one. I taught myself, never read it, and now I'm making wedding dresses and advertisements. But such a proposition is very simple and very basic. Why not try it yourself? But there is a question I want to ask, too. Is it because of the class? It's too simple. No channel, color system, calculation, LAB, GBR, CMYK and so on? Otherwise, it's useless at the end of the term, right?