Some people who have previously used Windows may become confused with how they are going to take screenshots with their Mac. There is a process that you can follow. First, you need to press Shift and Command 4. The crosshair can then be moved to the area that you would like to screenshot.
Drag this screenshot to the area where you would like to place it. Release your mousepad so that the screenshot can be placed in the area that you want. You can check if the screenshot is successful by looking for the .png file. You can do this as often as you like especially if you would need a lot of screenshots.