What do you want to know? I can tell you where to download a copy of Ubuntu (a popular version of Linux), and point you in the direction of documentation, but Linux is a big topic.

http://www.ubuntu.com/getubuntu/download
http://help.ubuntu.com/

Essentially, what most people know as Linux is really thirty years worth of software development on the Unix platform, and you're not going to learn a small fraction of that in 45 days.

--nigel
http://qatarjournal.com/~ngourlay/journal/