I assume other genres probably have them, but for scifi there’s a lot anthologies that cover short stories. I like them that the stories can be read in a session, sometimes multiple. One of the shortest I’ve seen is Isaac Asimovs postcard story, fits ona postcard!

Scifi that was the only way to get published way back when, scifi was seen as too risky for long form printing.

In scifi, it’s even goes further into themes so you can pick what you like. Examples would be ghost stories, or time travel, detectives, space ships only. Stuff like that.