What is the easiest site to sell stuff on?
Updated
The short answer
For digital files, the easiest site is a free-to-start storefront: sign up, upload, set a price, publish, share the link. For second-hand physical things it is a local marketplace app. For handmade or creative items it is Etsy, because the shoppers are already there.
Easiest means fewest steps between you and a working payment link.
Easiest for digital files
A storefront handles the page, the payment and the file delivery in one setup, usually in under an hour, with no monthly charge until you sell.
There is no shop to design, no shipping to configure and no app to install for delivery.
Easiest for things you already own
A local selling app or a general marketplace. Photograph it, write two lines, post it. The buyer comes to you.
These are fast because the audience is already browsing. That is also why they take a cut or charge for visibility.
Why "easy" changes after the first sale
Every easy platform is easy because it makes decisions for you. Later, those same decisions become limits: on branding, on buyer contact, on what you can list.
Start easy. Just do not build everything on it before you know whether it fits.