Want to sell digital product online

Heyyy, I'm new to reddit. Not sure how this works either. But I'm really looking for some platform where I can sell my digital products like PDFs, guides, and when the buyer purchases the product or gets it delivered to them. I was trying to use instamojo, but I saw how buyers may face issues like payment gateway errors and no refund issued to them.

I'm pretty confused as there's lots of information but none of them seems reliable. If someone has any idea please let me know. Thank youu.