title: Cloning git repository inside another git repository
body: <p>I cloned a repo from github (for example 'hello world') the I cloned another repo inside the hello world like this :</p>
  
  <pre><code>$ git clone ********hello_world
  $cd ~/hello_world
  ~/hello_world $ git clone  ***************another_repo
  </code></pre>
  
  <p>What's the relationship between them?<br>
  What if I delete the .git of the hello world?</p>