more git command (1)

9. git push
pushing changes
Your changes are now in the HEAD of your local working copy. To send those changes to your remote repository, execute
git push origin master
Change master to whatever branch you want to push your changes to.

If you have not cloned an existing repository and want to connect your repository to a remote server, you need to add it with
git remote add origin <server>
Now you are able to push your changes to the selected remote server

10. git branch
   git branch dev
  checkout branch

branching
Branches are used to develop features isolated from each other. The master branch is the
"default" branch when you create a repository.
Use other branches for development and merge them back to the master branch upon completion.

create a new branch named "feature_x" and switch to it using
git checkout -b feature_x
switch back to master
git checkout master
and delete the branch again
git branch -d feature_x
a branch is not available to others unless you push the branch to your remote repository
git push origin <branch>