How do you list categories in a category group? I would like to output a list of all the categories in a category group on the front end. How do I do that?
You can fetch your categories on the front end using craft.categories, which has a group param that can be used to filter categories by a given group handle.

{% set categories = craft.categories.group('myGroupHandle') %}


If the category group is limited to a single level, you can loop through those using a basic for-loop:

&lt;ul&gt;
    {% for category in categories %}
        &lt;li&gt;{{ category.title }}&lt;/li&gt;
    {% endfor %}
&lt;/ul&gt;


If the category group can be multi-level, you might be better off using the {% nav %} tag instead:

&lt;ul&gt;
    {% nav category in categories %}
        &lt;li&gt;
            {{ category.title }}

            {# Output a nested &lt;ul&gt; if this category has any children #}
            {% ifchildren %}
                &lt;ul&gt;{% children %}&lt;/ul&gt;
            {% endifchildren %}
        &lt;/li&gt;
    {% endnav %}
&lt;/ul&gt;