Git is the version control system used within the Yocto Project, including the Raspberry Pi BSP layer (meta-raspberrypi). Therefore, Git is a central part that you need to master before considering contributing to the Yocto Project and its subprojects.
Git is a distributed version control system that has been around since 2005 and is designed to handle projects with speed and efficiency, regardless of size. It was originally created to handle the source code of the Linux kernel. Git is free and open source and can be used by anyone without any need to pay licensing fees. The design of Git is highly suited to the manner of working used within open source projects. Besides the possibility of using distributed development, it has an easy logging mechanism to record who did what, cryptographic authentication of history, and an easy way to create branches, among other things.
One of the fundamental differences between many other distributed version control systems (VCS...