Live Nodelist vs Non-live Nodelist collections

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So I am in the process of learning how to manipulate the DOM with JS and I encountered the terminologies mentioned in the subject. I understand usually with examples so I wrote some code to see the difference but they still rendered the same stuff. I want to know whether if my node is live or not is going to affect my code.

//var parent = document.getElementById('parent');
//var parent = document.querySelector('ul#parent');
//var child_nodes = parent.childNodes;
//parent.appendChild(document.createElement('li'));
<!DOCTYPE html>
<html>
  <head>
    <title>Live vs Non-live</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
  </head>
  <body>
    <div id="page">
      <h1 id="header">List King</h1>
      <h2>Buy groceries</h2>
      <ul id ="parent">
        <li id="one" class="hot"><em>fresh</em> figs</li>
        <li id="two" class="hot">pine nuts</li>
        <li id="three" class="hot">honey</li>
        <li id="four">balsamic vinegar</li>
      </ul>
    </div>
    <script src="js/livenonlive.js"></script>
  </body>
</html>

Whether I select the parent ID with getElementById or by querySelector, they still update the document and append the child li.

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