If you prefer keeping your fingers on the keyboard as much as possible, Office 2013 provides keyboard shortcuts that you can use to find what you need on the ribbon instead of pointing and clicking the display.
Display the Office app you want to use.
Press and hold the Alt key. Letters and numbers appear on the tab names and the tools on the Quick Access toolbar.
While still pressing the Alt key, press the letter or number of the tab that you want to view.
When that tab appears, the shortcut keys appear on the new tab. Press the letter or letter combination to choose the tool that you want to use.
Additional keys for working with the ribbon
To select ...