Creepypastas are basically online horror stories. They are what many people call modern myths and legends. The name itself is a parody on the phrase "Copy pasta" which means that there are no official copywrite claims on them (except for one maybe) and anyone could write their own remakes or use other peoples characters. There are many forms of creepypastas. Ranging from lost episodes to psychopathic teenagers. So there is a beginner's guide to some of the many types of creepypastas.
But before we begin, there's some advice. If you are going to write your own, hugely disturbing and gory materials may not make a great creepypasta. Good build up with great suspense and a good payoff usually guaranties a great story. Plus likable characters and a great villain.
Type 1: Lost episodes.
These creepypastas are about a unknown person (usually the narrator) coming across a unaired episode of a beloved cartoon or live action show. Only to discover why it was never aired. The lost episodes feature many disturbing and gory imagery and would also feature the characters doing things that were completely off character. To be honest, I dought that these so called lost episodes are real. Why would the creators of a highly successful tv show create a episode with disturbing imagery and in doing so, risk their popularity and their careers? Perhaps these episodes were created by a rival company in order to get the series off the air? Who knows.
Type 2: Psychopathic teenagers.
These are the most popular types of creepypastas. They are about troubled and bullied teenagers who finally snap completely and start killing people. They would also suffer horrifying injuries or were perhaps experimented on (like having their faces burned, their eyes turn a funny colour, and gaining unrealistic superhuman abilities) Which would make them stand out and give them different characteristics. They would also have a significant weapon (a sharp knife mainly) and would also have a catchphrase (such as "Go to sleep!" or "Your time is up!"). But what nearly every one of these characters have one thing in common. Bad parents or relatives. Give Jeff the killer some credit, at least his parents were not bad (stupid yes but not horrible).
Type 3: Bad games.
These creepypastas are similar to Lost episodes. they are about a person finding a video game from their childhood (either by finding it in storage or buying it from a jumble sale) and deciding to play it again for nostalgic reasons. Only to realise that the game has changed a lot. They would feature horrifyingly gory and disturbingly images and have characters that address the player (either asking the player on why they haven't played in years, why did the player made them do something horrible, or that they'll get the player). In some versions, the game turns out to be possessed by a demonic presents and said presents would go after the player (which in many cases would ruin the creepypasta).
Type 4: Supernatural goings on.
These are basically stories about ghosts, demons, monsters, and other supernatural creatures. Some are based on real life myths and folklore (like the wendigo and skin-walkers). Many of these stories are about someone or a group of people being stalked or being menaced by a monsters and would often wonder why is it targeting them. These monsters would become famous in their own way. Like Mr Widemouth, Mr Nails, The Rake, and the infamous Slenderman (perhaps the first creepypasta ever made).
Type 5: Shorts.
These ones are properly the best ones. They are two or five sentence long stories that are short but to the point.
Type 6: Secure. Contain. Protect (SCP).
The S.C.P is a fictional organisation of doctors, scientists, researchers, military units, and agents who's soul purpose is to locate and contain supernatural items and monsters so that they cannot harm humans. They are catalogued into three categories. Safe (not harmful at all), Euclid (mostly not harmful unless provoked), and Keter (extremely harmful and dangerous to everything and everyone). These include a pizza box that will produce the holder's favourite pizza, a drinks machine that will give you any type of liquid, a room made out of human flesh, a statue that only moves when no one is looking at it, and a creature that doesn't like it when you look directly at its face.
Type 7: Rituals.
This creepypastas are step by step guides on how to perform rituals. Which will either summon demons or any other supernatural or satanic being. But please take my advice and NEVER try and perform theses in real life. Not only will nothing happen but many of them involve harming yourself.