Yea, having trained my muscle memory for at least 10 years on macs, my daily driver desktop is finally a modern Linux distro, and I'm having the most trouble with un-learning the ⌘ shortcuts. On Linux, sometimes "copy/paste" is CTRL-C/V, sometimes it's SHIFT-CTRL-C/V (meaning I need to position my pinky AND ring finger like I'm playing guitar or something). In terminals it's never CTRL-C/V, and once in a while there is an application where it's something bonkers. I kind of miss the universal ⌘ shortcuts that the entire macOS system and all 3rd party apps followed.
i'd suggest trying out toshy... it's a game changer for linux. you get almost all of the mac keyboard shortcuts working out of the box. there's a few rough edges sometimes but generally it feels like you're using a mac wrt shortcuts. even stuff like diacritics and textbox emacs shortcuts work if you want.