Something I noticed recently while wearing my (completely invisible but highly attractive) writing teacher chapeau is that the welter of SF subgenres and categories of fiction generally are terra incognita to a fair number of newer writers.
I’m okay with this. We begin as readers and viewers, after all. Many people coming into my UCLA courses are curious about speculative fiction. They aren't necessarily book-collecting, con-going, award-nominating fans. They've watched a fair chunk of genre TV and film offerings; they're up on the MCU, they can tell a spaceship from a unicorn and they even usually know which is the fantasy construct. They might have read a certain amount of fiction within their one or two favorite genres, or at least have read Harry Potter and his ilk to their kids.