Teaching according to law should refer to the relevant theories of education. Those who engage in education will have relevant methods to educate students. Of course, the methods at different stages will be very different.

Teaching without a fixed method should mean that there is no fixed method, society is developing and human beings are making progress, and educational theory should be able to keep up with the needs of the times and humanities, rather than blindly setting formulas. The words of sages in the past, the rules of ancestors, etc., just entered the misunderstanding of the law.

Similar to the process of how to take out all the content after thorough understanding. This process is summarized as a method of teaching and learning.

These three complement each other, revise each other and make progress together.

My humble opinion, please refer to.