UltimateUnknown on 16 June 2012
Well yea as people have said above. Probably the one thing that comes with adulthood is to learn to taking care of your earnings (money). Don't spend crazy amounts and waste, make sure you keep an eye out on your bank account to make sure you can verify all exchanges that are happening.
All the other things such as legal matters, etc will come to you naturally over time. You will just have to read a lot and make decisions, ones that your parents and guardians did beforehand for you. Other than that, you will become more mature as you grow, but nothing much changes about who you are. This whole turning 18 is waaaaaaaaaaaaaaaaaaaay overplayed.
