title: How do you NOT add untracked files in git?
body: <p>I was messing around and now I don't want to commit these files. How do I remove these from being committed?</p>
  
  <pre><code>git status 
  On branch sign-up
  Untracked files:
    (use "git add &lt;file&gt;..." to include in what will be committed)
  
      HEAD
      description
      hooks/
      info/
      sample_app/
  
  nothing added to commit but untracked files present (use "git add" to track)
  </code></pre>