Why is it important for young boys to leave home to be trained as a knight?

During the medieval era, knights were some of the most respected people because they were the lords of the battlefield and the protectors of the land. So if you were a knight, then you were definitely a big shot. Now boys had to leave home to be trained as a knight because he had to study under a local lord and assist the local lord as a page. He had to dedicate all his time to study the basic skills that he would need in order for him to become a knight. This included combat, hunting, history, and many other things too.