Not knowing the right keyboard shortcut means that, instead of quickly typing the relevant key combination, you need to (i) lift your hand from the keyboard, (ii) reach for the mouse in order to do what you want, and (iii) return to the keyboard. Keyboard shortcuts are extremely useful for purposes of improving your speed and productivity when working with Excel.The following are some of the reasons that explain this: Keyboard shortcuts are, perhaps, one of the Excel topics that virtually any user can (or should) be interested in.