Clicking each tab provides a whole new set of options. Tabs. The tabs on the ribbon are a way of organizing the many tools and options Word has.
You can customize which commands are available in the quick access toolbar by clicking the arrow to the right of the Redo button. By default, the quick access toolbar has (from left to right) Save, Undo, and Redo. Quick access toolbar. The quick access toolbar shows commonly used commands so that you can execute those commands with one button instead of a couple.