How can I display category title inside another category I would like to display a list of category.
I can display the information inside a category like slug or title.

However, I dont know how to display a category field inside a category.

    {% for category in craft.categories.group('handle') %}
       &lt;p&gt; {{category.title}} &lt;/p&gt;
       &lt;p&gt; {{category.title}} &lt;/p&gt;

    {% endfor %}
If I get you right you have a category select field inside a category. If you want to grab any field values from a category you can do it the same way as with entries. Code works almost the same.

{% for category in craft.categories.group('handle') %}
    &lt;p&gt; {{category.title}} &lt;/p&gt;
    &lt;p&gt; {{category.title}} &lt;/p&gt;

    {# You can access any field like you normally do inside your category #}
    {{ category.categoryField }}


    {# 
       If you want to access another loop-able
       field inside your category you can just make another loop.
       Like you're looping over entries
    #}
    {% for block in category.categoryFieldName %}
        {{ block.fieldName }}
    {% endfor %}
{% endfor %}