WHERE ARE YOU GOING?
To me, plot is the road map of your story. It’s how to get from point A to point B to point C, and so on. Therefore, it’s helpful to have a general idea of how you want the story to go. Write it down. Keep it where you can see it, so you won’t get off track.
In editing my novel, I noticed that I could have a romantic mess between my heroine and these three men in her life. She could be forced to marry one and secretly in love with her best friend’s betrothed, while the last one tries to get her attention because he’s in love with her. But I’m not writing a romance. It’s not the purpose of the book. It’s about her pleasing her father when others think she’s crazy to do so.
In writing, nothing is set in stone. You may change your mind in the middle of the book, or your characters may change it for you. But knowing where you want the story to go helps with plotting, like a map helps get you to your destination.