Github can only host 1 websites. As an open source code base and version control system, Github has more than 9 million developer users. As more and more applications migrate to the cloud, Github has become the first choice for managing software development and discovering existing code. As mentioned above, as a distributed version control system, there is no concept of main library in Git. Each replicated library can be used independently, and any inconsistency between the two libraries can be merged. GitHub can host various Git libraries and provide a web interface, but it is not the same as SourceForge, GoogleCode or coding services in China. GitHub's unique selling point is the simplicity of branching from another project. Contributing code to the project is very simple. First, click the fork button of the project site, and then check out the code and add it to the code base that you just separated. Finally, apply to the project leader for code merging through the built-in pullrequest mechanism. Some people call GitHub MySpace a code player. Branching in GitHub is just like making friends in Myspace, you are constantly connected in the nodes of the social diagram. The GitHub project itself is naturally hosted on GitHub, but it is in a private library that is invisible to the public.