Shopify is a proven platform for product sales. If you’re thinking of building something on your own, just keep in mind that creating a solid, scalable solution will take time and effort.
No. You won't sell more products just by having a Shopify store. But you can save time. Building an online shop can take a lot of time, especially if you haven't done it before. You can use that saved time to promote your product.
That’s pretty subjective. Shopify is faster to set up if you don’t have experience with anything else, but less customisable. I prefer Wordpress and Woocommerce.
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There are many open source alternatives available, such as WooCommerce, which is free and customizable.