Press Shift + Command + 3 to capture the entire screen
Press Shift + Command + 4 to capture a selected area
Press Shift + Command + 4, then press Spacebar to capture a window
Press Shift + Command + 5 to open screenshot options
Press Shift + Command + 6 to capture the Touch Bar on supported Mac models
On iPhone with Face ID, press Side Button + Volume Up
On iPhone with Home Button, press Side Button or Top Button + Home Button
On iPad, press Top Button + Volume Up
Use AssistiveTouch if physical buttons are difficult to press