So, you want information on Unix?
There is a dearth of info out there, but let's see if I can help point you in the right direction. IF you REALLY want to learn Unix/Linux, the best way is hands-on.
That being said, search the FAQ section of this forum for tips on how to download a *nix flavor. The distributor's website should have much information on the *nix that you choose.
Install, and then learn one great command:
man
type man man into the command line and start from there. Monitor these boards to learn more and don't forget to pay attention in class and pick your professor's brain.
Good Luck, the moderators here are great and I'm sure will be willing to help you out - Not with homework though