Are you looking for an easy way to set up an online store, built into your WordPress website?
One solution you may want to look into is Ecwid, an online shopping cart system. It provides you with a feature-rich store that you can easily add to WordPress.
Ecwid has one very cool feature: once you build your online store with it, you may then easily embed it into literally any existing website, thanks to its plugins, even if you are not a technically savvy person.
This video tutorial from OSTraining's YouTube Channel will walk you through the basics of incorporating your Ecwid store into your WordPress site.