What does it mean to say that a person has a foundation?

The foundation is your bloodline, Zugen, which is the seal of the eight characters. This is the basis of reproduction. The eight characters compare people's fate to a tree. The process of a tree growing is the process of a person growing. If a tree wants to grow well, it needs good soil first, so that the tree can take root, the wind can't blow it down, and it can stand on the soil. The basis is to see whether your ancestral grave is good or not, and whether it is good for your life.