Git is a version control system that can be used to manage WordPress website development. The document discusses lazy Git workflows that may save time compared to other approaches. It covers key Git concepts like remote repositories, branching, merging, pulling and pushing. Tools for using Git include hosting services like GitHub, Git GUIs, diff tools and text editors with Git plugins. The lazy workflow example shows ignoring everything except wp-content. Workflows include centralized, feature-based, and fork-based models.