Tapping the track pad in order to click has become a very popular way for selecting application or texts when using a Macintosh. Its popularity comes from the convinces factor of not having to press down completely on the trackpad every time. However, tap to click tends to be annoying for new users, who may find themselves selecting texts or applications when not desired. Other than tap to click, the trackpad has many other potential capabilities like secondary click, zooming, rotating, and a multitude of gestures. To find these trackpad customizations locate your System Preferences application, then open the Trackpad pane under Hardware. From there you are free to explore. Bellow is a quick overview of my most commonly used trackpad click and hand gestures.
Tap to Click
As described above, tap to click gives the user the connivence of being able to tap their trackpad (instead of pressing down to select) in order to select text or apps.
Secondary Click
This allows the user the ability to secondary click (a.k.a. right click), instead of pressing control + click.
Zoom and Rotate
Found in the Scroll & Zoom section, zoom and rotate is a quick way to zoom into or rotate photos in selected applications like iPhoto.
Swipe Between Apps
In my opinion this is the best gesture ever created. Although it is simple this gesture enables you to four finger swipe between your desktop screens.