At the beginning, we should combine practical learning, not just rely on theoretical processing centers, and the master should ask more questions and see more when doing it. Some things are not necessarily taught by the master, but can only be pondered by our own experience and theoretical knowledge. Besides, you should be bold and cautious in this line of work. Of course, don't blindly try something you are not sure about. This is what I learned at the beginning. I hope it helps you. Good luck.