The button next to me f12 is the eject button, lol... I'm a MacBook Pro.
Command + Shift + 3 = Full screen screenshot
Command + Shift + 4 = You can select the area for the screenshot
Command + Shift + 4 - Space = You can take a screenshot of a window
I wanted one of those, but the crappiest one costs around 3k USD in my lame country.