Man alive, OpenBSD's documentation is excellent. FreeBSD is good too, but there is just so, so much in the OpenBSD man pages. OpenBSD also strikes a very good

Man alive, OpenBSD's documentation is excellent. FreeBSD is good too, but there is just so, so much in the OpenBSD man pages. OpenBSD also strikes a very good balance between "informative" and "terse" that should be held up as a model for others. Unfamiliar things may need a few readings to get everything, but it's all there without being a toilet-clogger.