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The book of Genesis is about "Beginnings". Indeed, that's what the word "Genesis" actually means.
The book of Genesis speaks of the creation of the earth and humankind. It speaks of the entry of sin and death into the world and the promise of redemption. It portrays the depravity of human society which is destroyed in the flood with only Noah and his family escaping in the ark of safety. We are shown the development of the nation of Israel and the great promises to be fulfilled at the return of Christ, promises made to Abraham and confirmed to Isaac and Jacob. The last part of the book of Genesis is devoted primarily to the story of Joseph, one of Jacob's sons who became a pre-eminent type or foreshadowing of the Lord Jesus Christ: He was beloved of his Father, hated by his brothers, sold into the land of death [Egypt], but rose to sit at the right hand of Pharaoh. He then delivered his brethren from death and welcomed his family into his kingdom. This is a remarkable outline of the work of the Lord himself. Read yourself rich. Read the book of Genesis in one sitting. You will learn a lot!
I hope you have found this helpful.