Explore the web through the following links and learn more about computers.

Programming

http://www.funducode.com/
This is a site for programmers. It has discussion forums for C, C++, VC++, COM/DCOM, C#, .NET, Java programmers.

Web Designing

http://www.w3schools.com/
Learn all about HTML. This site contains easy and comprehensive, lesson wise lesson tutorials to learn HTML, XHTML, CSS, TCP/IP, XML, XSTL, XSL-FO, XPath, XQuery, XLink, XPointer, DTD, Schema, XML DOM, XForms, SOAP, WSDL, RDF, RSS, WAP, JavaScript, DHTML, VBScript, HTML DOM, WMLScript, SQL, ASP, ADO, PHP, .NET Microsoft, .NET ASP, .NETMobile, Media, SMIL, SVG, Flash and all about Web Building, W3C, Web Browsers, Web Quality, Web Semantic, Web Careers, Web Hosting and Web Certification.

Networking

http://www.compnetworking.about.com/
Learn everything about Networking.

Network Tools

http://www.network-tools.com/
This site has tools like Ping, Lookup, trace, Xwhois. It has other tools for Express Lookup, URL Unencode, URL Encode, HTTP headers and E-mail Validation. The best thing is that you can do all these things online without having to download any software to your hard-disk. All you have to do is enter your inputs in the web page itself and you get the output in the web page itself.

http://www.all-nettools.com/
This site has tools like SmartWhois, TraceRoute, Ping, NsLookup, Proxy Test and Environmental Variables Test. It also helps you to surf and e-mail anonymously.It also has a search engine to search through websites, usenet postings and ftp servers. Apart from these it has language tools like dictionary, thesaurus, etc. and conversion tools for measurement units and currency.

http://www.ipaddy.com/
Know your IP address and host-name.

Security

http://www.securityfocus.com/
This is a wholesome site on network security. This site is a treasure house of information regarding vulnerabilities, security tools, viruses, pen-tests and a lot more.

http://www.illmob.org/
This site has a discussion forum and thousands of security tools and other files.

http://www.illmob.org/0day/
All the tools and files of illmob.org is available here in directory browsing style.

http://www.governmentsecurity.org/
It has full of wonderful articles on various types of security issues.