Git is a version control systom.
Git is a free software.
/*update */
The first update.
Git is a free software.
/*second update */
Git is a wonderful software.
/*the third update */
Git tracks changes.

he is not a good man.

test origin push server.

create a new branch ;
test --no-ff -m command.
not use no-ff command.
have use --no-ff command.