Hi pals
Can u tell me any good sites that contains all the info about the hardware parts and there functioning?

Give This site a look, should answer your questions.

"Webopedia

The only online dictionary and search engine you need for computer and Internet technology definitions."

I like http://www.tomshardware.com/
The best way to do learn about hardware is a A++ certification book
I'm a computer science major and that's all about hardware that you will ned trust me focus on the software for anything more than fixing an occasional problem