The second paragraph of the Preface, page xv
This guide is not intended to answer every single question
you might have about Internet tools and culture. There are too
many local variables that we have no way of anticipating. The
Net itself changes so fast it is impossible to create a perfectly
stable source of information and instruction. The best operating
instructions for the Net are actually on the Net and are revised
continually. We have provided information about how to find many
help files and guides, but the best way to learn the technical,
social, and educational ways of the Net is to dive right into it.