Useful commands we tend to forget

Ctrl + C or Ctrl + Insert: Copy.
Ctrl + X or Shift + Delete: Cut.
Ctrl + V or Shift + Insert: Paste/Move.
Ctrl + N: New… File, Tab, Entry, etc.
Ctrl + S: Save.
Ctrl + O: Open…
Ctrl + P: Print.
Ctrl + Z: Undo.
Ctrl + A: Select all.
Ctrl + F: Find…
Ctrl + F4: Close tab or child window.
F1: Open help.
F11: Toggle full screen mode.
Alt or F10: Activate menu bar.
Alt + Space: Display system menu. Same as clicking the icon on the titlebar.
Escape: Remove focus from current control/menu, or close dialog box.