Let's get started with something simple, horror movie stereotypes. Horror movies all have the same cliches and the same characters in them. Let's start with the cliches.
Running on a road while being chased by a car
Every horror movie villain ends up chasing the protagonist/protagonists in a car at one point during the movie. The protagonist/protagonists never get off the road and sometimes even are killed by getting run over. There is a simple way to avoid this death. GET OFF THE ROAD!!! If that doesn't work and the villain does some off-roading and follows you, get somewhere a car can't follow. Like, climb a tree or anything that can get you out of the way of the car. For some stupid reason if you can't get off the road, jump out of the way of the car. Cars can't turn around that fast. So that gives you some time to get the fuck out of there.
People can't run without falling down
Why can't people run without falling in horror movies? I mean they aren't babies. Do you really need a how-to on avoiding falling? Fine. The only way I can help you is don't wear high heels. I can tell you from experience that high heels are hard to run in. They make you run slower than you would run normally. So DON'T WEAR HIGH HEELS!
The car never starts
Why doesn't the car start in horror movies? I don't know. Perhaps to pad out the movies run time out a little more. The only advice I can give you is to make sure your car isn't a piece of shit and works before you go on that trip or wherever you are going.
Splitting Up
Almost always people split up in horror movies. DO NOT SPLIT UP!! I REPEAT DO NOT SPLIT UP! Splitting up is what the horror movie villain wants you to do. They want you to split up so it's easier to kill you. Once you split up you have signed your death certificate. It gets worse if you split up and you end up on your own you are even more fucked then if you were with someone. At least if you're with someone you have a chance to stay alive. You have the chance that the horror movie villain will go after the person you're with first, giving you a chance to get the fuck out of dodge.
Adults are useless
If you are a child or young adult in a horror movie, do not talk to the adults about what's going on. They are useless and dumb as rocks. They won't believe you when you tell them about the killer or villain till it's too late, and they get killed themselves. Even if they do believe you they will downplay the seriousness of the issue. Again do not talk to adults.
Betrayed by one little sound
Let's say you were being chased by a killer. You manage to get away from the killer for a few minutes. You decide to hide under the bed like a child. Just as you get under the bed the killer walks into the room. Just as they were about to leave your phone goes off. Boom the killer found you and now you are dead. There is a way to avoid this death. Make sure your phone is on silent at all times. If you need to sneeze try not too. Do everything in your power to be silent.
Bad cell phone reception
In every horror movie that is in an isolated area cell phone reception is terrible. If you try to call anyone for help the call will not go through. If you need help call 911. Phones are now required to be able to call 911 even if there is no reception. But don't expect the police to show up on time though.
The dark basement
If you are moving to a new house make sure the basement is well lit. If it isn't get the fuck out of there. There is a good chance that a murder or some type of ritual went on down there. And if those went on in your basement there is a good chance that your house is haunted and bad things will happen to you. You may even get possessed by a demon.
Ignoring the elders warning
Yes Yes, I know old people can be dumb. But if you are stopping at an old gas station in the middle of nowhere and there is an old person either sitting outside the gas station or working at said gas station LISTEN TO THEM!!! I know you may not want to but listen to them. They will warn you about an urban legend about someone going around killing people or that someone just escaped from a mental hospital. Once you hear that get gas or whatever you were at the gas station to get like snacks; and then get out of there. If you don't you will get killed by the villain later on.
Creepy children
Children can be creepy. There I said it. If you are a child in a horror movie you can be creepy. It depends on if you are a protagonist or not. If you are a protagonist you are not creepy but will meet other children that are creepy as hell. If you see these creepy children get the fuck out of there. There is a giant probability that the kids are either ghosts, demons, or something else supernatural. So ya. Avoid creepy children at all costs.
Dropping the key
Have you ever dropped your keys? Of course, you have. But if you are in a horror movie you do not want to drop your keys cause you will either, A. lose them or B. You will find them but then will get killed cause the killer had time to catch up to you. Heck, you may even drop the keys down a grate if you are unlucky. The only advice I can give you is to make sure you have a strong grip on your keys.
Police always arrive too late/are incompetent
Remember when I said that phones are required to be able to call 911 even if it doesn't have service a few paragraphs ago? Ya, throw the idea of calling 911 out the window. If you do call 911 the police will show up too late to help you. They are also incompetent. If they do arrive on time they will be very stupid. And I mean stupid. If you try to warn them about the killer they will laugh and say you are being stupid because said killer is just an urban legend. Let's say they somehow believe you about the killer they will most likely be killed because they are stupid. They will walk right up to the killer and try to get them to get on the ground, then not run when the killer is walking right towards them. If you do dial 911 expect that the police officer that arrives on scene will be killed.
Sex will get you killed
Sex is great I know. But if you are in a horror movie avoid having sex like it is the plague. I know you may be tempted to have it since you are in an isolated area and think nothing bad will happen to you. Trust me you will be killed the moment you are done having sex. It seems the villains have some sex radar that tells them when someone is having sex. So if you want to survive avoid having sex.
Investigating in the dark
Okay, let's admit it the dark is terrifying. You don't know what could be hiding in the dark. There could be a spider, a spooky spirit, or even a killer. If you hear a noise coming from a dark corner or ally DO NOT HEAD TOWARDS IT! I don't care if the noise sounds like your best friend screaming for help. DO NOT HEAD TOWARDS IT! I REPEAT DO NOT HEADS TOWARDS IT!! If you head towards the noise you will die. The killer is most likely hiding in the dark and will ambush you. So avoid the dark.
Running upstairs to hide
Okay, so the killer is chasing you through a house. You can either run through the front door or up the stairs what do you choose to do? To run through the front door you say? Nope. If you are in a horror movie you choose to run upstairs to hide. Why do you ask? Honesty I can't tell you why the protagonists choose to run upstairs instead of out the front door. Perhaps the scriptwriters make it that way so they can pad out the movies run time. But do not choose to run upstairs. The killer can trap you on the second floor. So if you can, run out the front door.
Warning in dreams
Can you remember what your dream was about? Probably not. But if you have a dream about your friends or yourself dying in horrible ways try to remember it; it is a warning. It is a warning that is trying to get you and your friends out of trouble. If you don't heed the warning you and your friends will die a horrible death. You need to listen to your dream and get the hell out of wherever you are.
Indian burial ground
You know the rumor that Indian burial grounds are cursed? Well in horror movies people ignore the rumors and build right on top of Indian burial grounds. They may even be warned by an elderly person that what they are doing is wrong and that they are now cursed. When they do not listen to the warning bad things start happening. If a building is built on the Indian burial ground then the building will end up being haunted by poltergeists. Poltergeists that are evil and want revenge for the building being built on top of their resting place. The poltergeists will warn the people in the building to leave. But if the warning isn't headed the poltergeists will end up killing people in the building one by one. So if you hear a building is built on an Indian burial ground get the fuck out of there. Even it is just a rumor get the fuck out of there. You do not want to be killed by vengeful spirits.
Screaming for help in an isolated area
If you knew you were alone and isolated why would you scream for help? You know that no one else is going to hear you except maybe the killer. People in horror movies seem to scream even if they know that they are in the middle of butt fucking nowhere. The only person that is gonna hear you is the killer. So if you know you are being chased by the killer do not scream. You will do nothing but alert the killer to where you are.
Creepy hitchhikers
If you are driving down the road and you see a person on the side of the road DRIVE PAST THEM!!!!! Not only is it illegal in the US. There is a high chance that the person you pick up is either a killer, will lead you to the killer, or are related to the killer. If you do pick the person up be prepared to be chased by the killer or lead to your death. So do not pick up hitchhikers no matter how innocent they seem.
No guns
Okay so let's say the police showed up on time and aren't stupid chances are they forgot their gun. In horror movies, people don't have guns. Zombie movies are the one exception. You kinda need guns for those movies. So ya, in horror movie universes people don't have guns. Besides the police, but they are either too dumb to know how to use them or forgot them at the station.