What is the first book of the "Bible"?

The first book of the Bible is Genesis.

Genesis opens both the Christian Old Testament and the Hebrew Bible. It is also the first book of the Torah, or Pentateuch, the five-book foundational collection that continues with Exodus, Leviticus, Numbers, and Deuteronomy. The English name comes through Latin from the Greek word genesis, meaning “origin” or “beginning.” In Hebrew, the book is called Bereshit, meaning “In the beginning,” taken from its opening words.

Its opening chapters describe creation, Adam and Eve, Cain and Abel, Noah and the Flood, and the Tower of Babel. The later chapters focus on the patriarchs Abraham, Isaac, Jacob, and Joseph, ending with Jacob’s family living in Egypt. Genesis is sometimes confused with Exodus because Exodus begins the story of Moses and the Israelites’ departure from Egypt, but Genesis comes first and establishes the earlier family history. Traditional Jewish and Christian belief attributes the Torah to Moses, while modern biblical scholarship generally views Genesis as an anonymously composed work shaped over time.