Apple has a memory problem and we're all paying for it

So maybe I missed it or we are talking about the same things. Can you point me at the right thing to look for? Since you seem to be aware how these work natively.

• snapping windows by keyboard shortcuts (Win Key + Arrows on Windows)
• I want to have one output device by default (eg speakers), but select apps (Spotify for example) should output through my USB DAC.
• I can tab between applications no problem, but when I looked up how to change between windows of the same app (eg text editors), I came up with nothing. How is the shortcut called?

Cheers