Git is a version control system,yes you are right.
Git is free software,it is good.
Git second step.
Git diff.
day5
day6 stage test.
day 7 trace changes
day8 远程库
<<<<<<< HEAD
day9 create a  new branch and simple
=======
day9 create a  new branch & simple.
>>>>>>> featurel
day10 ,create the new branch
hi,my hello no no no,you must edited.