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There is no description of what this is on the main page, I just see a list of books. I’d add something to explain what it is.

Also, can I just read them on your site?

Hi! I just pushed a header which links to our blogs where we talk about how it works and what it is.

Yep, with any epub reader (or with native Apple Books on iOS) you can read all the books for free on the site by clicking the links.