This might be a good reference: https://popchart.co/collections/prints
It's a good starting point for a side project if you want to learn about how the platform runs.
I do have to say that if you are looking to make money from sales, rather than just practice your coding, I would strongly advise to use an existing platform such as Shopify or WooComm. Building an ecommerce platform gets quite complex quite fast, that it's not worth doing it unless the platform is your business.
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