Is there a quicker way than the Ribbon to get to frequently-used commands like Save and Switch Windows?
Short answer: Yes, use the Quick Access Toolbar. The Quick Access Toolbar is located above the Ribbon (or it can be moved below the Ribbon.) It can be customized to contain commands you use the most. The are several ways to add/remove commands from the Quick Access Toolbar, but the easiest way is to right-click any command/object on the Ribbon or Office button menu and choose “Add to Quick Access Toolbar” (see figure below.) You can add not only individual commands this way, but also entire groups of commands—for example, the Font group. Remove commands by right-clicking them on the Quick Access Toolbar and selecting “Remove from Quick Access Toolbar.