Can someone smart tell me all about Linux?

I have to learn all about Linux then write a paper on it and the resources I have (about 3 pages in an OS textbook and a few shitty websites) are lacking.

So if anyone out there can give me some info or link me to some good sites, I will be eternally grateful and very generous with rep.

I need this pretty quick, so help me out here.

p.s. I know that it has open source code, so it's constantly being upgraded, but would you say that it is almost literally going to keep growing and developing before a new OS replaces it?