title: Your branch is ahead of 'origin/master' by 3 commits
body: <p>I am getting the following when running <code>git status</code></p>
  
  <pre><code>Your branch is ahead of 'origin/master' by 3 commits.
  </code></pre>
  
  <p>I have read on some other post the way to fix this is run <code>git pull --rebase</code> but what exactly is rebase, will I lose data or is this simple way to sync with master?</p>