The worst fiction writing advice I’ve ever heard —- and the best fiction writing advice I’ve ever heard — is to write about what you love.
It’s very easy to get so caught up in the enjoyment of writing about something you love that you can go on forever and bore your reader to death.
It’s also some of the best writing you can do — if you follow all the advice you’ve ever heard on the craft of writing — because your heart will be in it and that alone will make it wonderful.