[Answered ]-Django Template Language Shows Up In Webpage

Template tags are wrapped in a {% … %}, not <% … %>

You thus implement this with:

{% extends "base.html" %} 

{% block page_title %} Challenges {% endblock %}

{% block content %} 
  <ul> 
    {% for month in months%}
    <li> <a href="{% url 'month-challenge' month %}">{{month|title}} </a></li>

    
    {% endfor %}
  </ul>
{% endblock %}