Who is the main keeper of knowledge in ancient Egypt?

The knowledge of ancient Egypt was kept by the priests. In fact, they were the carriers of this knowledge. So they had knowledge in the fields of astronomy, mathematics, medicine, chemistry, etc. In addition, the priests possessed secrets in various fields of science that have remained unknown in our time. Also, the priests played the role of religious nobility in this ancient state. They performed various rituals, sacrifices, and were also responsible for the burial of the pharaoh.