1.Communicate – Don't just walk around as if you don't know the other people who live in your house(even if you don't). Try to talk to them and make friends, it makes everyone more comfortable with each other which promotes better living.
2.Share – If a roommate needs something small, it would be nice if they did not need to go out and buy something already available. Sharing something with a roommate also makes them want to return the good deed.
3.Make Lists – For tasks that need to be done by everyone in the house, make a list. Grocery list, trash take out day, dish washing, etc. Making lists makes everyone responsible for chores which makes getting them done easier since everyone knows when they have to do any specific chore.
4.Clean Up – Cleaning up after yourself makes your roommates happier and makes the houses easier to live in.
5.Parking Etiquette – Since we don't have huge parking lots, parking etiquette is necessary to make parking easy. Try to park in such a way that the other roommates won't have a hard time trying to fit in parking spots.