Monsters:

It's very important to understand the monsters you're fighting. If you've never fought them before, obviously you might be surprised by some of their tactics. Some mobs nuke. ALOT. Others do alot more damage than like conned mobs.

Understanding the cons is extremely important as well.

At low levels, the con range is easy.

Grey = 3 or more levels below you
Green = 2 levels below you
Blue = 1 level below you
Yellow = same level as you
Orange = 1 level above you
Red = 2 level above you
Purple = 3 or more levels above you