Migrating Git repositories from Azure DevOps to Harness involves several challenges, such as managing authentication and access control, handling large repositories, ensuring correct dependency management, and replicating build and deployment pipelines. These challenges require careful planning and the application of best practices to ensure a smooth transition. Key strategies include conducting a dependency audit, using shallow cloning for large repositories, and systematically transferring build and deployment components. Harness Code Repository (CR) provides tools and documentation to streamline the migration process, with features such as Test Intelligence and Docker Layer Caching to optimize builds. Dewan Ahmed, a Principal Developer Advocate at Harness, emphasizes the importance of thorough planning, staged testing, and leveraging automation to enhance software delivery capabilities, drawing on his extensive experience in DevOps and software engineering advocacy.