Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
Git is easy to learn and has a tiny footprint with lightning fast performance.It outclasses SCM tools like Subversion, CVS, Perforce, and ClearCase with features like cheap local branching, convenient staging areas, and multiple workflows.
Learn Git in your browser for free with Try Git.
Pro Git by Scott Chacon and Ben Straub is available to read online for free.
Ref:Git使用笔记
Ref:gitignore
Ref:Git 在团队中的最佳实践--如何正确使用Git Flow
Ref:手把手搭建gitlab系列