I haven't installed FreeBSD yet, but when I read the handbook appendix I found a dead link. It is the Ohio state university Unix introductory course, under B.2 User's Guides. I looked up the WayBackMachine and found a snapshot of the link which works fine. http://web.archive.org/web/20180218152329/https://www2.cs.duke.edu/csl/docs/unix_course/