[jrjsmrtn]

Try Cmd-w (close), Cmd-X (Cut), Cmd-C (Copy), Cmd-V (Paste), Cmd-Z (Undo), Cmd-A (Select All), Cmd-Q (Quit) with your left thumb on Command and the left index on the other key. Try Cmd-P (Print), Cmd-, (Preferences) with your left thumb and a right finger. I'm using macOS and Windows since the 80s, Gnome and KDE later; I still think that Windows and Linux are generations away from macOS consistency and ergonomic...

[jrjsmrtn]

Moreover: on macOS Cmd[-Option][-Shift][-Ctrl]-<key> is always about a menu item/command shortcut; [Option][-Shift][-Ctrl]-<key> is always about a glyph.

[vapemaster]

well [ctrl] + <down arrow, F4, F5> are used for window management by default