git is control but cool.
git is good.
git is clear.
git is bangbang.
git is br.
git is Gpl.
git is seven.
git eight.
git nine.
git reset. 
git branch dev.
add branch new.
add branch new dev.
add branch dev2.
branch dra...........
wo shengqi le 
if no commit then checkout master,then it will merge.
try git stash...

try push master ----8.30
branch new master.