Using shortcut keys to access the ribbon

Pressing the Alt key on your keyboard grants you access to the shortcut keys available for each of the tabs. If you look at the tab shortcuts available (see the following screenshot), you will see that the Insert tab shows N as the shortcut key:

If you press the N key on your keyboard, further shortcut keys will present themselves for each of the options available under that specific ribbon:

Using these shortcuts allows you to quickly access the various tabs and options without using the mouse.