Press Command (⌘) + Shift + 3 to capture the entire screen
Press Command (⌘) + Shift + 4 to select an area to capture
Press Command (⌘) + Shift + 4, then press Spacebar to capture a window (or menu)
Press Command (⌘) + Shift + 5 to open the Screenshot toolbar
Press Command (⌘) + Control + Shift + 3 to capture the entire screen and copy to clipboard
Press Command (⌘) + Control + Shift + 4 to select an area and copy to clipboard
Press Command (⌘) + Control + Shift + 4, then Spacebar to capture a window and copy to clipboard