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Short thanks and dedications (about a page's worth, tops) can go at the front of the book, any lengthy "author's note" should, in my opinion, go towards the back, as "bonus material" 9as it were). ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/4135 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Short thanks and dedications (about a page's worth, tops) can go at the front of the book, any lengthy "author's note" should, in my opinion, go towards the back, as "bonus material" 9as it were). If it's needing to be in front to make the book readable, there's more work to be done on the book. Sometimes, more lengthy introductions work, but the few times I've seen that, it's either been a case of "early manuscript finished by new author" or "collection of stories" and that is not your typical book.