As soon as the natural time for weaning the child had come, he was transferred from the humble abode of his father to the royal palace, where he was brought up as the adopted son of the princess, his mother probably accompanying him and caring still for him. He grew up amid all the grandeur and excitement of the Egyptian court, maintaining, however, probably a constant fellowship with his mother, which was of the highest importance as to his religious belief and his interest in his "brethren." His education would doubtless be carefully attended to, and he would enjoy all the advantages of training both as to his body and his mind. He at length became "learned in all the wisdom of the Egyptians" (Acts 7:22). Egypt had then two chief seats of learning, or universities, at one of which, probably that of Heliopolis, his education was completed. Moses, being now about twenty years of age, spent over twenty more before he came into prominence in Bible history. These twenty years were probably spent in military service. There is a tradition recorded by Josephus that he took a lead in the war which was then waged between Egypt and Ethiopia, in which he gained renown as a skilful general, and became "mighty in deeds" (Acts 7:22).
#Source
https://www.biblestudytools.com/dictionary/moses/
