which Linux Course should i study?
Linux OS is not offered as a course in this academy.
Anyway I can only surmise what you mean: you mean here "course" to mean direction?
The best direction to take is to "try" to install a linux system, be serious and swear thyself "to make it run and usable" soon or later: only in this way you shall understand "what you need to know" and you shalt certainly know. One final clue: linux is meant for those who want to know and use it. This is not the world of Windows where the "expert user" knows only how to click the pointer; here you should learn to pound your keyboard too, so must learn how and what to pound on it (which means read tutorials first, then read, then read again.)
For a try, there is an easy install and upgrades via internet for Linux Mint (current version 6) it has installer live CD. Most windows past users go and learn from that distro. You need to download bittorrent first to download a good copy of the cd image.
If you get on it check back for more help. Goodluck.
"We've got to learn to crawl; before we learn to walk."
--from Steven Tyler (Aerosmith)