How to sync iBooks PDFs from my MacBook to my iPhone?

I have 26 book PDFs on my laptop but they won't show up on my iPhone. How can I get them to show up so I can not only read on my laptop, but also on my phone? They won't show up under "PDFs" or "purchased books" or "books" or anywhere.

Update:

I have the iBooks app on both devices and they won't sync. Maybe through iCloud? But I don't know how to do that. I read somewhere I need to do something with iTunes but I'm not sure how..?

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