One way to make a scary story is to start with a spooky setting, like an old, abandoned house on a dark and stormy night. Then, introduce a strange character, perhaps a shadowy figure that seems to move on its own. For example, a girl named Lily was walking home one night and passed by that old house. She heard a strange scratching noise coming from inside. As she got closer to the window to peek in, she saw a pair of glowing eyes staring back at her. She ran as fast as she could, but she could still hear the footsteps following her.
Well, you can make a scary story by basing it on people's common fears. Fear of the unknown is a great start. Say there's a town where people keep disappearing without a trace. Nobody knows who or what is causing it. The local sheriff starts to investigate, but every lead he follows ends up in a dead - end. One night, he gets a call from a terrified woman who says she saw a strange mist creeping towards her house. When he arrives at the scene, there's no sign of the mist, but he finds a strange symbol carved into her front door.