Imagine you're working on a group project at work or school, and you're all collaborating to create something amazing. That's kind of what might have happened with the book of Genesis - different writers contributing their ideas and stories over time. It's like a recipe book, with each writer adding their own special ingredient to the mix.
So, who were these writers? Well, some think that there were different schools of thought, each with their own style and perspective. It's like a cook-off, where each team is trying to create the most delicious dish, and in this case, the dish is the story of creation. The Jahwist and Priestly sources are two of the most well-known, each with their own unique flavor.