Add Shopify's New Dawn Theme has a lot of cool features, but one of the best is it allows customizations that previously required coding. I have been making tutorials on how to add code to your theme to create a page of collections or subs collections since before Shopify added sections, but now you don't even need to do any coding with Shopify's Dawn theme the first of Shopify's OS 2.0 themes.
Here is the step by step video. Enjoy! For Multiple pages of collections choose the 2nd video which is below this video.