Cathro's latest How To Bike video just dropped and it's excellent. He does a great job of distilling cornering down to three primary skills: Line choice, braking, and weight distribution (fore/aft). The rest (footwork, elbows, twisting hips, etc) are finishing touches. He touched on something I've preached for a while, your tires don't care about how you're positioned on the bike, they only care how much weight is on them, they're rolling freely and where they're pointed. If you can get those three primary aspects right you're most of the way there.