The manpages on OpenBSD are the finest you will find. SCO Unix's are
nowhere close (though the price on SCO is significantly higher than
OpenBSD's price...). Linux's are often spotty -- many programs don't
have manpages at all, and some manpages don't relate to what is actually
on one's machine. Sun's have their moments. So, any time you are
wondering "how do I mount a drive?", feel free to type "man -k drive" or
"man -k disk". When you want to know how to lock your terminal, type
"man -k lock".
The FAQ (on the website, and presumably on the website-on-the-CD on the
CD) has loads of good wisdom. I suggest reading through the whole thing
once, so that in six months time, when you want to do something else,
you can say, "I've read this before in the FAQ!".
O'Reilly has some spectacularly good books available for Unix. Many
people swear by Unix System Administrator's Guide.