Taking snapshots of your computer screen – for Mac
How to take a snapshot of the entire screen
1. Hold down Shift + Command (apple) then press 3
The image will be automatically saved to your computer desktop as a .png file.
How to capture a user-defined section of the screen.
1. Hold down Shift + Command (apple) and then press 4
(an arrow symbol will appear in place of the cursor, this can be positioned anywhere on the screen by moving your mouse).
2. To take a snapshot of a section of the screen, click and hold down your mouse button and drag the capture window to the size of the area that you want to capture. When you release the mouse button a snapshot will be taken and saved to you desktop as a .png file.