The Linux Documentation Project (TLDP) is run by a team of volunteers who write Linux and Linux-related documentation (see http://www.tldp.org). The set of documents contains tutorials for beginners, but is mainly focused on experienced users and professional system administrators. TLDP publishes HOWTOs, FAQs, and guides (handbooks) under a free license.
HOWTOs are usually a short, informal, step-by-step guide to
a specific task. It is written by experts for nonexperts in a
procedural manner. For example, how to configure a DHCP server. HOWTOs can
be found in the package
and are installed under