How can I RTFM when I don't have it anymore?

"RTFM" is an old saying: Read The "Fine" Manual. Sun still
sells printed manuals, but doesn't automatically distribute
them. As with all real UNIX systems, you do get a full set of
online "man" pages and there's a documentation CD.

The easiest way to find the documentation, though, is through:
docs.sun.com.