What I like about this post is that the author list novels written in each style. That is so helpful in understanding what readers expect in each sub-genre,
But even if you haven’t read much in the area you want to write about, get writing! You can always revise your work as you learn about the rules of your chose sub-genre.
Since the name “speculative fiction” is an umbrella for so many different kinds of storytelling, the author of the post couldn’t cover them all. I noticed “steampunk” is missing. For examples of this, try Michelle Levigne’s series Guardians of the Time Stream.
What other sub-genres are missing?