Genesis 1 and 2 are the two separate chapters of the same book- Genesis being the name of the book. Genesis 1 is believed to have been written later, as scholars think that the language is more archaic. Both are creation stories, but they tell different stories. Genesis 1 tells the story of God creating the earth in 7 days, and Genesis 2 tells the story of the creation of Adam and Eve, their time in the garden of Eden, and the Fall. Basically, Genesis 1 is the creation of everything, and Genesis 2 is specifically anthropocentric (concerned with humanity and our place in creation).