title: When pushing to remote Git repo using EGit in Eclipse, what should I choose?
body: <p><img src="https://i.stack.imgur.com/lWzLE.png" alt="EGit pop-up window"></p>
  
  <p>What is the </p>
  
  <pre><code>HEAD
  master [branch]
  </code></pre>
  
  <p>?</p>
  
  <p>What should I choose for the "Source ref" and "Destination ref", respectively?</p>