PowerPoint’s Ribbon interface is great for finding everything you might ever want to do in the presentation package — particularly things you don’t do frequently, like using the rehearse timing feature.
But if you’re looking to do common tasks fast, you’ll find keyboard shortcuts far more useful. Why bother to lift your hands from the keyboard if you want to open or close a presentation, apply formatting, or start a presentation?
There are keyboard shortcuts to accomplish a vast array of tasks in the PowerPoint desktop client, in both the Windows and Mac versions. (Fewer shortcuts are available for the Mac, but you can create your own custom keyboard shortcuts if you like.)