To implement a tag filtering feature, you can loop through all of the product tags in the collection using the all_tags attribute of the collection object.

{% if collection.all_tags.size > 0 %}
  <ul class="tag-filters">
    {% for tag in collection.all_tags %}
      {% if current_tags contains tag %}
        <li class="tag-filters__item active">{{ tag | link_to_remove_tag: tag }}</li>
      {% else %}
        <li class="tag-filters__item">{{ tag | link_to_add_tag: tag }}</li>
      {% endif %}
    {% endfor %}
  </ul>
{% endif %}