There have been many life-changing Linux moments for me, but most fade into my backstory as they become the status quo. There's one little keyboard trick Linux taught me that I'm reminded of every time I use it (maybe 1,000 times a day), and that's converting the Caps Lock key to Ctrl.
I use
caps:escape_shifted_capslockas an xkeyboard (setxkbmap) option.That way I can use it as Escape for Vim/Kakoune but still keep the caps lock functionality in reach