Add a Custom Page of Collection on The Minimal Theme in Shopify 

Customize a Page of Collections in Shopify by Creating a Custom Page Template and a Custom Section. 

page.my-custom-page.liquid

Copy the 1 line of code in blue for page template.

{% section 'my-custom-page' %}

SHOPIFY's NEW OS Store 2.0 allows you to create custom pages of content without having to code( click here to see the new method for custom pages of collections on Shopify's  Free DAWN theme)

This Video Tutorial shows customization of the Shopify Debut Theme allows you to add custom content on a page using the sections feature.

This Article contains the code blocks need for this theme customization seen in the video:

Page Template Code

page.my-custom-collections.liquid

{% section 'my-custom-collections' %}