If it is Lao Yang and Lao Yin in the Book of Changes, what should I remember?

Lao Yin and Lao Yang are collectively called "deviant", also called "dynamic". It is called "change" or "move" because the old Yin and Lao Yang will change, Yin will become Yang, and Yang will become Yin. If there is no "change", just look at the hexagrams directly. If there is a "change", look at the changed words. The prediction or wording you get is the result of your prediction.