Microsoft Office products use something called Hot Keys that give you the ability to navigate the Ribbon without ever actually touching the mouse.
This type of keyboard shortcut doesn’t involved holding down any modifier keys (like Control or Shift.)
To get started using Hot Keys, just press the Alt key on your keyboard. You’ll immediately notice that each tab on the Ribbon has a letter beside it.
Next, just type the letter associated with the tab you want to visit. At this point, every command on the Review tab will have a letter associated with it. To select that command just type the letter beside the command. Voila!