I already mentioned the documentation files, installed typically under the directory /usr/src/linux/Documentation. They are a real gold mine of useful information.
The following FAQ (Frequently Asked Questions) are periodically posted in the group news:news.answers and archived on FTP servers like ftp://rtfm.mit.edu :
FAQ of the group news:comp.os.linux.announce
FAQ of the group news:comp.sys.hp.hpux
A lot of other Linux HOWTO contain information useful related to our subject :
The following Usenet groups cover subjects related to HP :
You may also consult the groups mentioned in Section 2.2.2.5.
On Internet, you may consult with a great benefit the following sites :
Table 7-1. Web sites of HP
Table 7-2. Other fundamental sites on Linux and Open Source Software