Genesis is a book about beginnings.
It moves from the morning of the world to the ordering of families and nations to the birthing of the fathers and mothers of Israel. The ancestral stories begin with Abraham and Sarah and continue with Isaac and Rebekah, Jacob and Leah/Rachel, and the sons of Jacob, focusing on Joseph.
While God was there "in the beginning," Genesis also testifies to the beginnings of God's activity in the world. It is a new day for God, too. And, given the divine commitment to the creation, God will never be the same again.