The Craft of Writing, or Yes, Virginia, It's a Learned Skill is an essay by Macedon, the author of the Talking Stick Series.
It was written in 1996, then revised in 1998.
The essay contains several pointers on the nuts and bolts of fiction writing and covers such topics as handling point-of-view, dialogue, sentence structure, openings, and foreshadowing. This guide has appeared on several writing guide rec lists.
The essay itself doesn't have a fannish focus, but in 1998, Macedon appears to have added a fanfic addendum.