Git is a decentralized version control system, meaning that there is no one superior repository. Every single copy of a Git repository is just as complete as any other. Of course we can pick one particular repository and declare it to be the one source of truth, the “upstream” repository. Usually this upstream repository is then hosted on some server, and if we are interested in openness and collaboration this server is part of a larger web service, called a “forge”. Out of these forges GitHub is perhaps the most popular one. Unfortunately this means if we are interested in contributions we have to make the GitHub repo our upstream and use its web services and web UI for our workflow. At least that is the common wisdom, but it does not have to be that way.