Plot is most often about a conflict or struggle that the main character goes through. The conflict can be with another character, or with the way things are, or with something inside the character, like needs or feelings.
The main character should win or lose at least partly on their own, and not just be rescued by someone or something else. Most often, the character learns or grows as they try to solve their problem. What the character learns is the theme.
The conflict should get more and more tense or exciting. The tension should reach a high point or “climax” near the end of the story, then ease off.
The basic steps of a plot are: conflict begins, things go right, things go WRONG, final victory (or defeat), and wrap‑up. The right–wrong steps can repeat.
A novel can have several conflicts, but a short story should have only one.
At the beginning, jump right into the action. At the end, wind up the story quickly.
Decide about writing the story either in “first person” or in “third person.” Third‑person pronouns are “he,” “she,” and “it”—so writing in third person means telling a story as if it’s all about other people. The first‑person pronoun is “I”—so writing in first person means telling a story as if it happened to you.
Even if you write in third person, try to tell the story through the eyes of just one character—most likely the main character. Don’t tell anything that the character wouldn’t know. This is called “point of view.” If you must tell something else, create a whole separate section with the point of view of another character.
Decide about writing either in “present tense” or in “past tense.” Writing in past tense means writing as if the story already happened. That is how most stories are written. Writing in present tense means writing as if the story is happening right now. Stick to one tense or the other!
Before you start writing, know your characters well. Create them, get to know them.
Your main character should be someone readers can feel something in common with, or at least care about.
You don’t have to describe a character completely. It’s enough to say one or two things about how a character looks or moves or speaks.
A main character should have at least one flaw or weakness. Perfect characters are not very interesting. They’re also harder to feel something in common with or care about. And they don’t have anything to learn. In the same way, there should be at least one thing good about a “bad guy.”