it is a distributed version control system. Git is a free software. abctest try again Git has a mutable index called stage. Git tracks changes of files. diff My stupid boss still prefers SVN. where try Creating a new branch is quick. Creating a new branch is quick and simple. Today is Friday! --no-ff,git merge. use ff,git merge. --no-ff! need fix a bug! fix issue-101. add a new row. now is 11:24.