(Disclaimer: this is by someone who has never seen a horror movie or been through anything like it)
•Stay in public area. Safety in numbers.
•Old people are your friends. Unless the story they tell involves them doing something bad and someone cursing something. In that case, leave.
•Stay away from butcher shops.
•Stay away from graveyards.
•Loners, "nerds", and smart people in general are your friends. Don't let them out of your sight.
•OLD BOOKS AND STATUES WITH WEIRD DESIGNS ARE TO BE AVOIDED AT ALL COSTS!!!
•Only go into churches for holy water and bibles. Ignore priests and other church people.
•Guns and knives are good, unless the killer has them. Then they're bad.
•Tall grassy areas and woods/forests are bad.
•Stay in a house in a town or city. Houses in the woods or away from society are always targeted first.
•Paranormal professors can be either your greatest ally or the cause of all the problems. Ask about their past first.
•Babies crying at night in a supposed haunted house are ghosts. Call your kids down and vacate the area. Unless you don't have kids. Then leave.
•Stay away from athletes, blondes, and couples. Remain single.
•Stay away from bodies of water. This includes baths and showers. Use wet wipes.
•If someone acts ettcentric, avoid them unless a different person acts even more so.
•If you call the cops, go to the station in person. They won't believe you on the phone, or if they do, they won't get there in time.
•If you work in a agency revolving around supernatural entities, have a therapist on speed dial and don't be ambitious (Iceberg.).
•Creepypastas bad. Just gonna put that out there. Especially "imaginary friends".
•Stay away from wells.

Write in the comments if you can think of any more.