Short version: everything you have given it. The Knowledge Center splits your sources across several cards so each one is manageable, but that split is about where you go to edit something. It is not a limit on what Arbyn is allowed to read when a customer asks a question.

When a customer asks something, Arbyn compares the meaning of their question against all of it at once and pulls whatever genuinely relates. A question that only your About page answers gets answered from your About page. A question that only a blog post covers gets answered from the blog post.

They used to be listed in two places, which made it look like you had to add them somewhere.

You do not. Your Shopify pages and blog posts are read straight from Shopify, so they belong with your other Shopify content, and that is the only place you need to manage them. The Documents card is for things that exist only inside Arbyn: files you upload, policies you write here, FAQs you add.

Nothing about that grouping changes what Arbyn reads. Both are indexed the same way, both are searched on every question, and neither ranks above the other because of which card it appears under.

Writing a good About page is support work. If you explain your materials, your ethos or your sizing there, Arbyn will use it to answer customers, without you copying any of it into a document.

A blog post answers questions forever. A post about how to care for a product becomes the answer to every future care question, automatically.

You rarely need to duplicate anything. If the information already exists on your store, adding it again as a document does not make Arbyn better at finding it. It just gives you two copies to keep in sync. Write it once, in the place it naturally belongs.

Go to Knowledge. Each card shows how much of that source is indexed, and you can open any of them to see the individual items.

If something specific is not being found, Knowledge, then Knowledge gaps shows the real questions Arbyn could not confidently answer, in the customer's own words. That is a better guide to what to write next than guessing.

Does Arbyn read a page as soon as I publish it? New and updated pages, posts and products are picked up automatically. There is nothing to press.

Can I stop Arbyn using a particular page? Unpublish it in Shopify, or move the content somewhere you do not publish. Arbyn only reads what your store publishes.

Does the order of the cards mean anything? No. It is a layout, not a ranking. What decides which source answers a question is how well that source matches what the customer asked.

Is a document I upload treated as more authoritative than a page? No, with one exception worth knowing: Arbyn's built in general knowledge always ranks below your own content, so your store wins whenever it has something to say.