Here is a list of sites with some very good documentation for various computer topics

Random Books online
• Really Cool Reference Bookshelves Networking, UNIX, Web, Perl, Java
• More Really Cool Reference Bookshelves Java, Perl, TCP/IP, UNIX, Java Enterprise, Linux, Oracle PL/SQL, Web
• Big Documentation
• Linux Documentation Project

Sun Docs and Resources
• bigadmin solaris sysadmin guide pdf
• Solaris OE Certification info
• Network Chan ges Setup howto
• Unix Rosetta Stone
• Sun.com/bigadmin
• Unix Guru Universe
• Solaris Tips
• Solaris One Liners
• Solaris Archive
• Advanced Bash scripting howto