How to understand git remote message?

Question

I have create a new local repository (using git init, followed by adding and committing some files). Later I added a remote repository:

$git remote add br /home/user/work/git/bare/

I can see it through command git remote -v Also git fetch br was successful

When I switch to this repo, it gives following message:

$ git checkout br/master

Note: checking out 'br/master'. You are in 'detached HEAD' state. You can look around, make experimental changes and commit them, and you can discard any commits you make in this state without impacting any branches by performing another checkout. If you want to create a new branch to retain commits you create, you may do so (now or later) by using -b with the checkout command again. Example: git checkout -b new_branch_name HEAD is now at a155c68... Added Makefile.in`

I did not understand the above text? what is 'detached HEAD' state?

Just to add:

$ git branch * (no branch) master $

I am at no branch, how/why?

possible duplicate of Why did my Git repo enter a detached HEAD state? — Makoto
– Makoto, Commented Jul 2, 2015 at 6:25

Melebius · Accepted Answer · 2015-07-02 07:47:50Z

You checked out a commit pointed to by a remote branch (you can list them using git branch -r). If it’s not pointed to by any local branch, it results in detached head. You should set br/master as upstream of your local master.

git checkout master git branch -u br/master

You can then synchronize your local and remote master branch using git push and git pull.

Thanks @Melebius, it seems I need to learn more and more practice.

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