LIST OF COLLECTIONS - Creating custom page that display collections
By default, Shopify only allows to have one page to display your store collections (you cannot create different "collections of collection", as you can do with product).
This is definitely frustrating. To make it easier, our themes come with a simple way to create pages that display list of collections. If you have a lot of collections, you can therefore organize your navigation so that your main menu redirects to different "list of collections" page.
Here is how you can take advantage of this feature.
Create a new menu that will hold links to collections. To do that, you need to open the "Navigation" page in the Shopify admin, or simply click here if you are already logged.
Make sure that your links are only pointing to collections. If you have links that are pointing to products, they will be ignored.
Write down the handle (outlined in red below). In this example the handle is my-collections. We will need it later.
Create a new page in Shopify admin. In the "Content" part, write only the handle of the menu we have just created. In my previous example, the handle was my-collections, so I simply need to enter my-collections as the content of the page. In the bottom right box "Templates", choose the template "page.list-collections" / "page.collections" / "page.collections-grid" (the exact name depend on the theme / theme version you are using, but you should have at least one of those three):
Save the page to create it and make sure to add this page to your navigation to make it accessible to your visitors.