Holding the right mouse button will allow you to move the camera manually
Important basic controls:
Double clicking a monster will automatically attack them. Alternatively, selecting a monster and pressing 3 aion gold will also attack them.
Holding Control (Ctrl) and double clicking a player will enable PK mode and attack the corresponding player. However, killing someone over 4 levels under you if you initiated the first attack will net a Rogue Point. Rogue Points are bad.
You can use the mouse to move, or you can use the WASD keys to move. The arrow keys (quickly) turn the camera.
Holding the right mouse button will allow you to move the camera manually.
Double clicking with the right mouse button will allow you to move to the target spot. This is especially helpful if you use the mouse to move and you're traveling through a highly monster-infested area. This way, you don't accidentally attack a monster.
On the left side of your HP and MP bar are two arrows. If you slide these over to the right, a HP or MP potion will automatically be used once you’re HP or MP drops below the arrow. Thanks to Special for pointing this out to me.
Dragging a Magic Stone or a Prayer Stone to an unequipped piece of equipment will attempt to socket the respective Stone into the item. You will lose the Stone if it fails, but not the item.