Common OS X tasks can be found in the File and Application menus, as well as through right-clicking. Learn how to use them here.
Many tasks will require you to right-click with your mouse or trackpad. This usually allows you to access a menu with useful shortcuts, which will vary depending on which application you're using. In OS X, right-clicking is disabled by default, but it is easy to enable the feature.
If you don't have right-clicking enabled, you can still perform a secondary click (right-click) at any time on your Mac. Just press and hold the Control key on your keyboard and click the mouse.
If you have a trackpad, you can tap it with two fingers to right-click. You can also go to System PreferencesTrackpad to choose other right-click options for the trackpad.