Okay kiddo, so you know how there are lots of different ideas and beliefs in the world? Well, sometimes there are a few ideas that are a little bit different from what most people believe. These ideas are called heterodox teachings.
Now, in China, they have a system of laws that govern how people should behave and what they can and can't do. Some of these laws are considered heterodox teachings because they go against what most people believe.
For example, one heterodox teaching in Chinese law is the idea of "legalism." This is the belief that the law should be very strict and that people should be punished harshly if they break the law. Most people don't believe in such a severe approach, so legalism is considered a heterodox teaching.
Another example is the idea of "Confucianism," which is a belief system that emphasizes respect for authority and traditional values. While this philosophy is very important to many Chinese people, it is considered heterodox because it is not always in line with modern ideas about individual freedom and personal choice.
So you see, heterodox teachings in Chinese law are just ideas that are a little bit different from what most people believe. They may be important to some people, but they are not always the standard way of thinking.