Keys: ⌘ ⌥ ⌃ ⇧
- Entire screen: Shift-Command-3
- Selection of screen: Shift-Command-4, draw rectangle
- Window: Shift-Command-4, space
- Touch Bar: Shift-Command-6.
Show hidden files
Command + Shift + . (Period)
To use these shortcuts, first press Fn-Control-F2
to put the focus on the menu bar.