if you want to screen shot on Mac the easiest way to do it is to click on command, shift, 4. Then your just have to put your mouse over the area that you want to screen shot and a box will appear, what ever is inside the box his what you have screen shotted.
Wow I am so happy there is finally a tutorial on this technique! I have seen so many cool creations made with this and I really hope to try this myself! ❤️ 😄