This is an article that, while from 2015, I thought was pretty good and pertinent to both fanfic writers/readers and non-writers.
https://www.bustle.com/articles/71438-13-things-fan-fiction-writers-are-very-tired-of-explaining
https://www.bustle.com/articles/71438-13-things-fan-fiction-writers-are-very-tired-of-explaining