cmd-K for Cut? I don't ever remember that on the Mac.

I remember the lower left row on the US keyboard was always the first four operations from the nearly-ubiquitous Edit menu since day one.

    Z - Undo 
    X - Cut
    C - Copy
    V - Paste

Early apps frequently also had "Clear" in the Edit menu, which was like Cut except the cleared item didn't go into the system Clipboard