Learn to shave/trim up your beard.
You shouldn't be getting a shytload of razor bumps on the regular by the time you leave college.
If you travel, follow the age old proverb "When in Rome, do as the Romans do."
Learn the do's-and-dont's of where you're at.
Or at the very least, the don'ts.
If you drink alcohol,
know your limit.
Listen to your body rather than peer pressure.
Everyone knows their body's unique way of telling you "

SLOW. DOWN."
Better listen to that than your "friends" who would just get you shythoused for their own selfish reasons (have a funny story to tell the next night, make them look better in comparison to the girl with the glasses and

booty, etc...)
And drink water while drinking liquor; you'll be glad you did in the morning.
Because there is nothing more off-putting to a lady (or worse, someone who can get you something/somewhere incredible) than a cat vomiting or

on the floor because he can't handle his liquor.