Hey there, @ASPaath!
Ryder here, from the Social Care Team at Shopify. Thanks for posting! I'm glad to hear you're interested in selling courses on your online store, and I'd be happy to recommend some apps that can help you get there.
Some merchants will embed their courses onto a page, and use the Locksmith App to lock content so that only customers with specific credentials can access it. You can create conditions for access to a page, such as a requiring the customer has a specific tag added, or has purchased a specific product (i.e. the course). This app offers a 15 day free trial, and then starts at $9/month USD (depending on which Shopify plan you're on). Often merchants will also like to provide a downloadable version of the course, and will use our free Digital Downloads App to link attachments to particular products. Customers will receive the download after checking out, as well as an emailed link.
I hope this information helps get you started with your education products! Please let me know if there's anything I can elaborate on.
Once your customers will purchase a course, it will appear in a special My Courses page in their account: