1. I got a purple salvage drop and used a regular salvage kit on it. Crap! You need expert salavage kits for those.

2. I bought 2 runes of holding (500 gold each) in Yak's Bend and upgraded my two 5 slot bags to 10 slot bags. That part wasn't stupid. I then bought a third rune of holding and tried to use it on my belt pouch. Doesn't work. Then I bought another bag and tried to put it in the pouch slot so I could use the rune. Doesn't work. Lost 300 gold on that.

3. **spolier** I aggroed the entire freaking Charr army in one of the main quests.
4. I am a warrior and I vendored hundreds of pieces of wood before I learned they are an ingredient in charcoal.

5. I dyed my newbie armor, not realizing how much dye sells for on the other side.
6. I failed to stock up on belt pouches in pre-searing, nor realizing how much they resell for in post searing Ascalon.
7. It took much longer than I care to admit to realize that the space bar is the attack button.

8. That little circle around your character on the mini-map? That's your aggro radius. Who knew? But guess what? Sometimes stuff runs over and pounds you anyway, even if they are outside that circle.
9. I bought Gwen a cape for 200 gold, not realizing she would give you the tapestry if you just keep handing her flowers.
10. You can't use bleed attacks on mobs made out of rocks. Makes sense, but that was need to know info I needed to know before several missions started.