Computer

Programming

Java
This is online java tutorial of java by its owner Sun from start to end with tips.

Operating System

Ubuntu

This is linux ubutu which is a freeware.You can use and share for free.It is designed to match your flexibility.You can download it or request to get an CD for free(without shipping cost also)

Internet
Security
Hardware

Hardware Hell
Get you fully prepared for knowing on hardware of computer absolutely free