"For enterprise Linux customers, such as RHEL and SLES, there
are specific resources that you want to be aware of. These fall
into the category of vendor- or distro-specific information, so the
same thing applies for other distros as well. If you’re an
Ubuntu fan, you’ll probably want to frequent the popular
forums, for example.
"Red Hat Enterprise Linux, or RHEL as everyone calls it, is the
most popular enterprise-ready Linux version. The RHEL resource
center is surprisingly quite useful. You will find links to many
resources: documentation, articles, forums, and even sales pitches
(it is a business, after all). One can’t-miss resource is the
Red Hat Magazine. Red Hat Magazine is full of articles that explain
new features, provide insightful hints for dealing with common
issues, and keep you current on all things RHEL-related."