Mac-haters seldom spare an opportunity to diss Apple fans about the absence of a dedicated print-screen key. However, there are more screenshot options available on a Mac if you know the shortcuts.
Capturing entire screen to a file on the desktop
Capturing entire screen to clipboard
Capturing a specific screen area
1. Command + Shift + 4 (saved on desktop)
2. Command + Control + Shift + 4 (copied to clipboard)
Capturing a specific window
1. Command + Shift + 4 + Spacebar, then select a window (saved on desktop)
2. Command + Control + Shift + 4 + Spacebar, then select a window (copied to clipboard)