title: When do you use POST and when do you use GET?
body: <p>From what I can gather, there are three categories:</p>
  
  <ol>
  <li>Never use <code>GET</code> and use <code>POST</code></li>
  <li>Never use <code>POST</code> and use <code>GET</code></li>
  <li>It doesn't matter which one you use.</li>
  </ol>
  
  <p>Am I correct in assuming those three cases? If so, what are some examples from each case?</p>