Shopify Narrative Theme: Page template for "Feature a subset of collections on a page". https://help.shopify.com/themes/customization/collections/featuring-collections-using-link-lists

page.list-collections.liquid

<div class="shopify-section">  
  <div class="list-collections-template" data-section-id="" data-section-type="list-collections-template">
    <div class="page-width">
      
      <div class="grid text-center">
        <div class="grid__item medium-up--ten-twelfths medium-up--push-one-twelfth">
          <header class="section-header text-center">
        	<h1 class="section-header__title h2">{{ page.title }}</h1>
      	  </header>
          <div class="rte">
            {{ page.content }}
          </div>
        </div><!-- grid__item -->
      </div><!-- grid -->

      {% comment %} Set number of columns here: {% endcomment %}
      {%- assign desktopColumns = '2' -%}
      {%- assign mobileColumns = '1' -%}

      {%- capture gridClasses -%}
        {% if desktopColumns == '3' %}medium-up--one-third {% else %}medium-up--one-half {% endif %}
        {% if mobileColumns == '2' %}small--one-half {% endif %}
      {%- endcapture -%}

      {% if linklists[page.handle].links.size > 0 %}
        {% assign number_of_links = 0 %}

      	{% comment %} BRIAN disabled animations with animations--disabled class (below) because of product items not displaying properly on mobile. {% endcomment %}
        <div class="animations--disabled card-list grid" data-desktop-columns="{{ desktopColumns }}" data-mobile-columns="{{ mobileColumns }}">
          <div class="card-list__column grid grid__item {{ gridClasses }}">

          {% for link in linklists[page.handle].links %}
            {% if link.type == 'collection_link' %}

              {% assign collection = link.object %}
              {% assign number_of_links = number_of_links | plus: 1 %}

              <div class="card critical-clear" style="opacity:1;">
                {% comment %} Enable image spacing is added with .card__wrapper--padding {% endcomment %}
                <a href="{{ link.url }}" class="card__wrapper card__wrapper--padding text-center">

                  {% if collection.title == blank %}
                    {% assign collection_image = blank %}
                  {% elsif collection.image %}
                    {% assign collection_image = collection.image %}
                  {% else %}
                    {% assign collection_image = collection.products.first.featured_image %}
                  {% endif %}

                  {% unless collection.title == blank %}
                    {% include 'card-image', type: collection_image %}
                  {% else %}
                    <div class="card__image-wrapper">
                      {% capture current %}{% cycle 1, 2, 3, 4, 5, 6 %}{% endcapture %}
                      {{ 'collection-' | append: current | placeholder_svg_tag: 'placeholder-svg' }}
                    </div>
                  {% endunless %}

                  <div class="card__info">
                    <h3 class="card__name h4">{% if collection.title != blank %}{{ collection.title }}{% else %}{{ 'homepage.onboarding.collection_title' | t }}{% endif %}</h3>

                    {% if collection.description != blank %}
                      <div class="rte card__description{% if width == '2' %} card__description--padding{% endif %}">
                        {{ collection.description | strip_html | truncatewords: 50 }}
                      </div>
                    {% endif %}
                  </div><!-- card__info -->
                </a>
              </div><!-- card -->

            {% endif %}
          {% endfor %}

          </div><!-- card-list__column -->
        </div><!-- card-list -->
      {% endif %}

    </div><!-- page-width -->
  </div><!-- list-collections-template -->
</div>

In "Create your new page template", step 5, you are asked to download some code hosted on GitHub. If you're using Shopify's Narrative theme, you can use the above code instead.