Press Command (⌘) + Shift (⇧) + 3 to capture the entire screen
Press Command (⌘) + Shift (⇧) + 4 to capture a selected area
Press Spacebar after Command (⌘) + Shift (⇧) + 4 to capture a specific window
Press Command (⌘) + Shift (⇧) + 5 to open the Screenshot toolbar (screen, window, or selection)
Press Control (⌃) + Command (⌘) + Shift (⇧) + 3 to copy the entire screen to the clipboard
Press Control (⌃) + Command (⌘) + Shift (⇧) + 4 to copy a selected area to the clipboard
Press Control (⌃) + Command (⌘) + Shift (⇧) + 4, then Spacebar to copy a window to the clipboard
Open the Screenshot toolbar with Command (⌘) + Shift (⇧) + 5 and choose Record for video screen capture