How to distinguish yin and yang in Zhouyi

Don't be too mysterious about the so-called "Yin and Yang". In philosophical terms, "Yin" and "Yang" are actually two opposite sides. For example, if a person contains yin and yang at the same time, your hand also has two sides: the palm is yin, the palm is yang, and even vice versa. Just regard "Yin and Yang" as a set of corresponding symbols.