I mean, there are three types of writers: pantsers, plantsers, and plotters.
Plotters are the guys who plan the entire story from scratch before writing it.
Pantsers, aka me, are the ones who basically only have a vague idea of some parts of the story, such as how the story starts or just a single cliffhanger idea. They just go with the flow and write what comes to their minds.
Plantsers are both combined. They write-down just some scenes that they want to include, you know?