title: Django {% block %} explanation
body: <p>I'm a Django beginner and I wanted to try and learn some of the Django-CMS basics.</p>
  
  <p>When I started editing the default template that was generated by the installer, I noticed there are <code>{% block ... %}</code> blocks, but I couldn't find any documentation on what <code>block</code> means or more specific what <code>block title</code> and <code>block content</code> mean.</p>
  
  <p>Both the Django and the Django-CMS documentation lacks of such an explanation, which is weird given the fact that this seems pretty basic. When I removed the <code>block title</code> block, the title got messed up.</p>
  
  <p>I'm using:</p>
  
  <ul>
  <li>Django 1.8.15</li>
  <li>django-cms 3.4.1.</li>
  </ul>