Shopify is an awesome platform. It’s my preferred ecommerce environment. But it’s not as full-featured as Magento, out of the box.
Related Products, for example. It’s not part of the standard Product page layout. And if you don’t have it, it’s a wasted opportunity.
Here is a link to a Shopify Blog article about how you can CODE Related Product functionality. It’s not a drag-and-drop App – it requires liquid code.
And there are different levels of capability, depending on whether you are on Shopify Plus, how many products/orders you’ve add, which will affect whether the Related Products are manually or automatically generated.