These documents are associated with the Linux Documentation Project. There is an Index page that I suggest you bookmark in your browser.
These HOWTO's are written by Linux users and are periodically updated by the authors. Many authors provide the latest version at a personal website and a hyperlink to the latter is typically provided in the document . This version may be newer than that available at the LDP website. The document may be published online before its inclusion into the LDP database.
Note also that other HOWTO's are available, the authors of which have not submitted them to the LDP. It is definitely worthwhile trying to find these using an Internet search engine as I describe in a subsequent section.
These documents are particularly useful when you decide to provide or access a new service with your Linux system, or when you embark on a technically complex project. For example, you may have the option of accessing the 'net with an ADSL or Cable Modem service - excellent guides are available in the form of HOWTO's.
In addition, authors often include references and links to sites that they have found useful. You may find the information you need at one of these hyperlinked sites rather than in the HOWTO itself. For example, I found Linux Network Drivers , the primary site for information about Network Interface Card drivers , in the Ethernet HOWTO.