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Unless you’ve achieved Unix guru status, you probably find yourself asking “how did he know that?” whenever you’re around other Unix users or read a really cool snippet in a book. Here’s a little secret: he probably had to look it up. As I tell my students, “No one knows everything. Make sure the one thing you do know is where to go to get the information you need.”
If you’re using FreeBSD, there is no shortage of well-written documentation. If you haven’t already, bookmark the FreeBSD Documentation page at http://www.freebsd.org/docs.
There you’ll find hyperlinks to the four handbooks, the FAQ, how-to articles, online manpages, as well as other sources of information. There’s a very good chance that someone else has already documented what you want to do.