What we're some of your mistakes with MapleStory when you first joined?

Built all stats without knowing LUK and INT were useless for a warrior... which required a re-build.
Built Iron Body (pre-Big Bang) without realizing it was useless at the time... which required a rebuild... again.
Listened to someone say DEX for a warrior (pre-Big Bang) was useless... only later realizing I couldn't attack worth squat and needed it.
Sold an Elemental Wand 5 (w/ Blue Font Label) right after they were originally released for 1 Billion mesos, when I probably could have gotten more.
Didn't buy more 2x EXP Cards (like the timed monthly cards) when they were still available.