It's one of the three main axioms of writing, "Write what you know." But does that mean you shouldn't write about something unless you know it inside and out? Not at all, Ben Yagoda writes in the New York Times. Instead, just learn it: "The idea is to investigate the subject till you can write about it with complete confidence and authority. Being a serial expert is actually one of the cool things about the very enterprise of writing: You learn ’em and leave ’em."
