excel Accessing the Ribbon by using your keyboard

At first glance, you may think that the Ribbon is completely mouse-centric. After all, none of the
commands has the traditional underlined letter to indicate the Alt+keystrokes. But, in fact, the
Ribbon is very keyboard friendly. The trick is to press the Alt key to display the pop-up keytips.
Each Ribbon control has a letter (or series of letters) that you type to issue the command.

Its shows how the Home tab looks after I press the Alt key to display the keytips. If you
press one of the keytips, the screen then displays more keytips. For example, to use the keyboard
to align the cell contents to the left, press Alt, followed by H (for Home) and then AL (for Align
Left). If you’re a keyboard fan (like me), it will just take a few times before you memorize the
keystrokes required for common commands.
After you press Alt, you can also use the left and right arrow keys to scroll through the tabs.
When you reach the proper tab, press the down-arrow key to enter the Ribbon. Then use the
left- and right-arrow keys to scroll through the Ribbon commands. When you reach the command you need, press Enter to execute it. This method isn’t as efficient as using the keytips, but
it’s a quick way to take a look at the choices on the Ribbon.