ExtremeTech has published an article on getting the most out of your Gmail e-mail account.
The keyboard shortcuts available within Gmail are, without any doubt, the quickest route to speedy productivity within the application. The time investment in learning the keyboard shortcuts of all of your computer's applications always pays off, as you are able to navigate your system much more quickly than before. Instead of reaching off the keyboard, grasping the mouse, moving it to the right place and clicking, keyboard shortcuts allow you to press just one button. You don't lift your hands off the keyboard, and when you're really good at typing, you don't even need to look at the screen.