List of Pages in a Collection (Eleventy)

postloop.njk

<ul>
  {% for page in collections.post %}
  <li>
    <a href="{{ page.url }}"> {{ page.data.title }}</a>
  </li>
  {% endfor %}
</ul>

This will show all pages that have a tag of post in their front matter. To use a different tag you can change what collection is used. For example:
{% for page in collections.blog %}

You don't have to use 'page' You can call the page whatever you like as long as it is a valid variable name for the template langugage (Nunjucks is used here). This would also work:

<ul>
  {% for banana in collections.post %}
  <li>
    <a href="{{ banana.url }}"> {{ banana.data.title }}</a>
  </li>
  {% endfor %}
</ul>