Drupal 8 loop entity reference fields.twig

Twig coding standards
https://www.drupal.org/node/1823416

Filters - Modifying Variables In Twig Templates
https://www.drupal.org/node/2357633


{% for i, value in content.field_app_prod_toggle_products %}
  {% if node.field_app_prod_toggle_products[i].entity %}
    {% if i == 0 %}
  <div class="tabs-panel is-active" id="panel-0">
    {% else %}
  <div class="tabs-panel" id="panel-{{ i }}">
  {% endif %}
    <h2>{{ node.field_app_prod_toggle_products[i].entity.field_product_subhead.value }}</h2>
    {{ node.field_app_prod_toggle_products[i].entity.body.value|t }}
    <h3>{{ node.field_app_prod_toggle_products[i].entity.field_product_highlight_title.value }}</h3>
    {{ node.field_app_prod_toggle_products[i].entity.field_product_highlight.value|t }}
    <p class="explore-product-btn">
      <a class="button" href="{{ path('entity.node.canonical', {'node': node.field_app_prod_toggle_products[i].entity.id}) }}">Explore <i class="fa fa-arrow-right" aria-hidden="true"></i></a>
    </p>
  </div>
  {% endif %}
{% endfor %}