How to understand the "harmony" in the core of China traditional culture?

The first harmony is harmonious harmony, and the second harmony is a combination of fusion. Generally speaking, the core of China's traditional culture is to emphasize that harmony is the most important thing for all things to make money, harmony is the most important thing, and harmony is the core. Most of the modern people's solutions are to abandon, eliminate and eliminate.

You might understand it better if you have knowledge of Yin-Yang and Five Elements.