title: Default remote for git fetch
body: <p>If I am on a local branch that is <em>not</em> tracking any remote branch and I give the command</p>
  
  <pre><code>git fetch
  </code></pre>
  
  <p>Given I have several remotes defined in <code>$GIT_DIR/config</code>, from which remote is the fetch done?</p>
  
  <p>I tried to find out from the <a href="https://www.kernel.org/pub/software/scm/git/docs/git-fetch.html" rel="noreferrer">man page</a>, but this point is unclear to me.</p>
  
  <p>Additionally: How can I change this default remote without making the local branch tracking?</p>