thanks to @solitarygigi for the suggestion to make this an open list
  1. Toilet paper is cheaper than therapy.
  2. Don't pick sides in roommate drama.
  3. Don't gossip about roommates to other roommates.
  4. Always wash your dishes right away.
  5. Give your roommates a heads up when you're having an overnight guest or a party.
  6. Let your roommates know if you're going to be home late (or not at all) so they don't worry about your safety or get scared when they hear a door opening at 3am.
  7. Don't feel like you have to force a friendship with your roommates. Sometimes you will hit it off, other times you just won't. You still have to share a living space. Know when to just be roommates.
  8. Make sure that your home/room/apartment (whatever y'all are sharing) remains a safe space for everyone.
    I think that was the best thing my roommates and I did for each other this past year. No matter what, the room was always a welcoming place to the 3 roommates. No one ever felt like she couldn't be in her own room because of a situation that one of the other roommates had created.
    Suggested by @lexie_elyse
  9. Leave the house sometimes!
    I am such a homebody, so I live alone. If you have roommates, even if they are your BFFs, they want to be home alone every now and then. Go away for a weekend, stay out later than normal, anything that gives them some solo time.
    Suggested by @Boogie
  10. Don't finish other people's groceries, and don't almost finish them.
    One teaspoon of Orange Juice in the jug is the exact same as no orange juice. If it's not yours, don't finish it. If it's something you would have had an emergency without (like the last tampon or squeeze of toothpaste), replace it immediately.
    Suggested by @Boogie
  11. Have a cleaning schedule.
    If you share a bathroom or a kitchen they will need to be cleaned regularly. Everyone is responsible for keeping the shared spaces clean.
    Suggested by @solitarygigi
  12. Be sure to V O C A L I Z E your expectations and don't be attached to the outcome. Also, chip in to hire a maid! It honestly saves you from so much resentment and tension.
    Suggested by @marykathryn
  13. If anyone in the room has a significant other, set some expectations about using common living spaces.
    I have literally lived with someone whose boyfriend would be in our living room WHEN SHE WASN'T EVEN HOME. It's extremely frustrating, and it's an awkward conversation. Have this talk early. Also, no one wants to walk in on you and your SO having sex on the living room couch.
    Suggested by @crossedties