I don't remember all the keybinds, but by default there's a few that do certain things. For example:
- Pressing the F key will assist your target
- Pressing the U key will do a Left Click I believe (useful for gathering nodes)
I can't remember the rest off the top of my head. Worth checking the key binds though for more!
Also middle mouse clicking on your HP/Mana/Endurance bar changes the border style. It'll add things like a snake, gems, a totem looking thing, etc.