Git Guru is a blog dedicated to exploring various aspects of Git, including its suitability for enterprise use, the differences between rebase and merge, and effective branching strategies. It serves as a valuable complement to other Git resources like git ready by offering insightful discussions and reviews on these topics. Created by Chris Wanstrath, Git Guru provides readers with in-depth analysis and advice, making it a useful resource for anyone looking to enhance their understanding and use of Git in development workflows.