How to Accomplish Expertise

How do we gain expertise? Do we need to be methodical about it? Or do we just sort of happen, right? We just encountered so many vast amount of experiences that through that process you become an expert. That's what most people rely on is just the slow accumulation of experiences. So there's nothing wrong with it except it's awfully slow and it's awfully haphazard. And in a lot of situations we rely on feedback, but the feedback isn't always reliable. There are ways to speed up the growth of expertise, to accelerate its development.