Why were the Egyptians called the “teacher-teachers” of ancient civilizations?

The Egyptian civilization, which arose more than four thousand years ago, is rightfully considered one of the most ancient. It was the Egyptian civilization that created one of the very first forms of writing, the hieroglyphs, the Egyptians built great architectural structures that still cause us a sense of respect for them. It’s about the pyramids.
The Egyptians had advanced knowledge in the field of medicine, astronomy, physics for that time, had significant success in military affairs. It was on the basis of Egyptian civilization that the first states of the Middle East, and then Europe, were formed.