Win+P allows you to quickly change how your windows works. Win+K brings up the menu to connect to a wireless monitor. Win+L will lock the screen. Win+R will call the "Run..." window.
KDE Plasma also inherits a lot of the shortcuts Windows has. AFAIK MATE/Cinnamon do also share some of the keybinds, but for some reason they use CTRL+ALT instead.
Also fun fact: the Windows key is also called the SUPER key.
Ome thing I don't quite like about kitchenowl is how the grocery list doesn't really seem to allow entering amounts of stuff, which is especially annoying when you try to shop for ingredients for a recipe. Otherwise it's a phenomenal app in terms of unifying cookbook recipes as well. The autosummaties also work quite well, it seems.