A few very small annoyances I have run into moving from Windows and am wondering if anyone might have a few solutions or explanation.

Context: never used mac before, 2 days into using, macbook pro 14 inch, no monitor so screen size limited, need to be able to effectively split screen for what i do. 1. The fade, when switching between fullscreen apps, that damn short fade animation. I have turned off reduce motion and from search online i understand there is no concrete solution, but. along shot i guess. 2. Not all move & resize shortcuts seem to work. Up and down do not work using shortcuts, but left and right do. Up and down does only when I go and click the function itself. 3. Is hiding apps using Ctrl + H the best way to go about it? Realised minimising or 'x-ing' apps means you cannot Ctrl + tab back to them. 4. Is there a way to figure out exactly what some shortcuts do? I notice menu bar at top flashes which section the shortcut should be in but oftentime it's not there. 5. For some apps, there is more than one shortcut for the same thing, maybe this is only after i have added a shortcut, but like for switching chrome I added option + 1 for previous tab and option + 2 for next tab. But command + option + l/r arrow still do it, I thought they would change after I added my own shortcut? Of course these are all tiny tiny things and I fully understand I am being pedantic, but any help or usage aadvice much much appreciated, thank you.