There are couple of ways to take the screenshot or Print screen on Mac. Most of the steps have already been mentioned above. But let me let you there is also an option to take screenshot of any Mac remotely using the terminal command. You can also customize the way screenshot( Print screen) process works on Mac using some terminal command.. You can find all the details here http://www.hawkdive.com/2016/04/how-to-take-screenshot-on-mac.html