Actually I think my analogy of writing as a swimming pool with a shallow and a deep end is pretty useful.* People like to separate genre and literary writing as if they're completely disconnected, but that's not true. Really it's a spectrum, with subservience to genre conventions at one end and near-complete freedom from them at the other. But before you leap into the deep end you should know how to swim pretty darn well. Some people seem to have absorbed this along with grade-school grammar and spelling, or from reading a lot. Their brains are wired differently, they can absorb the basics without needing to study. If you're one of them you already know it and nothing I or anyone else says here applies to you. But of course you won't find them hanging out on a writing forum dedicated to learning craft and skills. The natural writers (AKA geniuses) were getting published when the rest of us were learning how to flip burgers or deliver newspapers. * Actually let me change that to a lake or an ocean, where you begin by splashing around in the shallows close to shore before you roam out into the deep.