We don't always take time to say, "I've written ten active sentences in a row so maybe I'll whip in a passive one now" or "I need a beat for every X lines of dialogue." I published four novels and edited dozens more before I learned what a beat was. (It's a pause so reader can catch his/her breath.)

And, of course, since it is writing and not speaking, we can always go back and revise later. Then rely on editors to catch what we missed, or at least make us wonder why we wrote it this way instead of that way.

Some authors aren't even consciously aware of "the rules." They've never taken a class, never read a book about writing. They're simply avid readers who one day decided to write. But they've internalized rules as well. It comes from reading.

I've said it before and I'll say it again. If you want to write, you must read. If you don't like reading, maybe writing isn't for you. It's not about writing because you want to say, "I am a writer." It's about writing because you enjoy writing.

And, it's really nice when you've been writing for a long time to go back and read a book about how to write. You might find one or two things to tweak in your technique, as opposed to a daunting laundry list of flaws. It's much easier to internalize one or two new rules than 50 or 100!