Git is a version control system
Git is free software..........

//xiugai
Git is a distributed version control system
Git is free software.
//xiugai 2
Git is a distributed version control system.
Git is free software distributed under the GPL.
//3
Git has a mutable index called stage
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Git tracks changes of files.
//5
github
Creating a new branch is quick and simple
//6 new --no-ff git merge
//hello by