Ok, you probably already know how to capture and image of your screen with your Mac. It’s Command-Shift-3. That will leave an image on your desktop, you can even hit Command-Shift-4, and get a little crosshair to select only a portion of your screen and do the same thing.
BUT…if you’re like me, and you’re planning on editing that image in a program, then there is an even cooler way to do this.
Hit Control-Command-Shift-3 (or 4)
This will copy the image to your clipboard, so you can simply paste it into your editing program of choice.