The site is legit but not everything that appears there may be. The forum
itself cannot verify information. Its users will check information, but
there are no guarantees.
I disagree a bit about using Google. I do it myself, but much info will be
dated, especially for a distro such as Ubuntu which changes so much. For
example it could tell you to edit a file such as gconf that is no longer
used in Ubuntu. Or a user can quickly get over his head using someone else's
comand line help and totally wreck his set up. Google is good, but it is a
time consuming crap shoot. If your search skills are good and you know what
to believe and discount then it can be rewarding. At least in a forum others
can serve as a check and prevent bad or dated advice freon sneaking through.
Just be smart and take it slowly.