You can write a story about anything you want. All you need are the basics. So before you write, it helps to know the ingredients of a story. I'll show you how. It has a beginning, a middle and an end.
Some stories even end up in the same place they started.
For example, in The Wizard of Oz, Dorothy starts out in Kansas, travels to Oz in a cyclone and ends up back in Kansas. Moki the Gecko starts out happy, gets mad about pollution and ends up happy at the end. You get the idea. The person, animal or thing your story is about Every story starts with a main character. It can be any animal, human or thing you want it to be.