A bit of confession: I just learnt about this very recently.
Arion’s question: Where is the print screen button in my Mac ?
Answer : There isn’t any. Of course, it is a bit impossible for Mac to not provide that function, the answer lies in a combination of command key (the button with apple on it) + shift + 3. You’ll hear a shutter like noise and voila , the screen is captured and saved in your desktop.
In fact, you can do funkier stuff by only capturing parts of the screen that you want to capture ! Apple button + Shift + 4 , suddenly a crosshair ( that’s a cross-like pointer, by the way ) appears and you can drag it around the area to capture. Another shutter noise indicates that the picture has been saved in your desktop ! Noiiceee !! 😉