Absolute OpenBSD contains a rather good section on pf, it doesn't assume any knowledge about TCP/IP or other networking topics, and the writing style it pretty good IMO.
I would consider it very suitable for beginners.
Not sure if Absolute FreeBSD also contains a section on pf and/or if it's equally good, I don't have this book.
I don't have The book of PF so I can't compare.
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UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.
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