You ever go bowling? The experts will tell you you need to curve the ball in order to bowl correctly. That's kind of the advice you're getting here. They're describing how to take a turn at top speeds efficiently. You should learn that too, and practice it. But right now it seems to me that you're having trouble with simple turning. I'd pratice that on a blacktop at a local elementary school or a parking lot without any traffic. Once you get the basics of riding down, you can have a coach teach you to do it like the pros do.