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Whole Screenshot
Partial Screenshot
Window Screenshot
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Whole Screenshot

1. Press command-shift-3 together to capture of everything that is currently displaying on your screen(s). The screenshot will be automatically saved as a .png on your desktop.
   NOTE: To cancel, press the Escape (esc) key before you click.

Partial Screenshot

1. Press the command-shift-4 keys together. The pointer changes to a crosshair pointer.
2. Move the crosshair pointer to where you want to start the screenshot.
3. Click and drag to select an area. While dragging, you can hold the Shift key, Option key, or Space bar to change the way the selection moves. The screenshot will be automatically saved as a .png on your desktop.
   NOTE: To cancel, press the Escape (esc) key before you click.

Window Screenshot

1. Press the command-shift-4-space bar keys together. The pointer changes to a camera pointer.
2. Move the camera pointer to the window to highlight it.
3. Click your mouse or trackpad to take the screenshot. The screenshot will be automatically saved as a .png on your desktop.
   NOTE: To cancel, press the Escape (esc) key before you click.

Learn More

Take a screenshot of a menu

1. Click the menu to reveal its contents.
2. Press Command-Shift-4 keys. The pointer changes to a crosshair pointer.
3. Click and drag to select the menu.
4. Release your mouse or trackpad to capture the image. The screenshot will be automatically saved as a .png on your desktop.
   NOTE: To cancel, press the Escape (esc) key before you click.

Take a screenshot of a menu without the title

1. Click the menu to reveal its contents.
2. Press Command-Shift-4 keys. The pointer changes to a crosshair pointer.
3. Press the Space bar. The pointer changes to a camera pointer.
4. Move the camera pointer over the menu to highlight it.
5. Click your mouse or trackpad. The screenshot will be automatically saved as a .png on your desktop.
   NOTE: To cancel, press the Escape (esc) key before you click.

Tips and Tricks

• By default, screenshots are saved as .png files on the desktop in Mac OS X v10.6 and later. They're automatically named "Screen Shot date at time.png."
  
• To save your screenshot to the Clipboard instead of a file on your desktop, use the command key in conjunction with the shortcuts above .
• You can open screenshots with Preview or other image-editing apps.
• Some apps, such as DVD Player, might not let you take screenshots of their windows.

Article Source: https://support.apple.com/en-us/HT201361

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