Pro Tip - USE ELECTIVE MODE: If you're reading this, you are more than likely an experienced gamer, so it is at this time I urge you to immediately turn on Elective Mode upon starting a game of Diablo 3.
The default mode is a tutorial mode meant to guide people not familiar with action RPGs. Elective mode will open up the game for you if you've spent this entire time being restricted by the button assignments/Skill Categories.
Options -> Gameplay











