When a father brings his son to cheder for the first time, the father is very happy because his son is starting to learn Torah. The Tzemech Tzedek of Lubavitz zt’l said that this helps us understand the great joy in heaven on Shabbos Bereishis. It is a new beginning, and Hashem rejoices that His children will be studying the parashah each week. ~ R’ Elimelech Biderman