If you are looking for #PF resources for #openbsd and #freebsd alike, the up to date slides for the #tutorial are at https://nxdomain.no/~peter/pf_fullday.pdf with updates for each session.

In addition, we (the good people at @nostarch and yours truly) are working to get the 4th edition of The Book PF ready and available as soon as possible (see https://nxdomain.no/~peter/yes_the_book_of_pf_4th_ed_is_coming.html or tracked https://bsdly.blogspot.com/2025/07/yes-book-of-pf-4th-edition-is-coming.html)