get a credit card. f what everyone else says. log what you purchase and pay it off the same day. i just graduated from college and managed my credit perfectly all 4 years. because of this i am eligible for loans for important things, like a down payment on a house.

you will also need a credit card in order to rent or lease anything in your name, like an apartment, which you will most likely move into in the next few years. the sooner you start building your credit, the better. only spend money you have, and don't be an R-tard.

the cardinal rule is to leave it at home when you go out drinking