Use a trackpad or mouse
In OS X, you interact with your Mac using gestures that let you switch between…

Turn the volume up or down
To change your computer’s volume, click the Volume control in the menu bar, then drag…

Use the built-in camera
If your Mac or display has a built-in iSight, FaceTime, or FaceTime HD camera, you…

Connect a display
You can easily view your Mac desktop on a display, such as an Apple Thunderbolt…

Use AirPlay to see your desktop on an HDTV
AirPlay Mirroring lets you send what’s on your Mac to an HDTV wirelessly with Apple…