Apple has a pretty exhaustive list of so-called document shortcuts that I find particularly useful: https://support.apple.com/en-us/HT201236#text
Ctrl+A and Ctrl+E in particular to jump to the beginning and end of a line are a pair that I use dozens of times per day.
Same with Opt+Delete to delete the previous word.
I use Opt+Left Arrow and Opt+Right Arrow to move the cursor back and forward by whole words so often that I didn't even think about including it in here until I unconsciously used it while editing text.
Also:
Cmd+Space brings up Spotlight and is a great way to launch apps and open documents.
I've used SizeUp for well over a decade to rearrange my Mac's open windows. It's literally the first app I install when I get a new computer. https://www.irradiatedsoftware.com/sizeup/