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The Featured collection section is designed to attract customers to see certain collections and products primarily. This section is usually displayed on the home page and will allow you to show the products from a collection of your choice.
It’s an effective way to cross-sell and up-sell your products and is also a great place to emphasize your new arrival, most popular, and best seller items.

First, the collection you wish to feature must be created and products should already be added or assigned to it.
Here's a Shopify guide that should help you build your own collections. →After adding the Featured collection section, you will be presented with customization options and settings that you can adjust to match your store's style.