dude, just check the wikipedia:http://en.wikipedia.org/wiki/Linux...

dude, just check the wikipedia:
http://en.wikipedia.org/wiki/Linux

linux has been around for a while...
unix_minix_linux

then maybe look for some books, almost every country has some store(or online capabilities) to acquire a book on the subject(there are many of them!)
cheers for your desire to help.
if ya still cant find a book, just ask...
Linus made it, and now thousands are still workin on it,once you start,well you just realize again how much more there is to learn.
the first place to start,is to know there is a "community"...

Click Here!