hi ..i just want to ask that in which areas one can do specialization in linux? which areas are there for specialization in linux?

Kernel developer or IT work like RHCE RHCT ( Redhat Certified Engineered , Redhat Certified Technician ), distro maintainer to name a few

thank u...it helped me to understand clearly..

Personally, what I would do is to "get a job ... any job ..." in a Linux-based shop. Then, once you're "in," be very attentive to everything that's going on around you, except that you purposely turn your head whenever a password of any sort is being entered. As people give you things to do – and they will be small things, at first – diligently do them. Ask questions freely: it's far better to ask, than to not-ask.

In this way, you begin to build up trust in the minds of the others. That's key.

Perhaps, later down the line, you'll be offered a chance to attend professional-training courses (which may or may not lead to "certifications"), at your employer's expense, and if that happens take advantage of it. But, don't look for "shortcuts," and don't try too hard to specialize.

I also recommend Virtual Machines, especially if you are just trying out different linuxes. You can run Linux under Windows XP, 7 or 8, without doing a dual boot. And it's safer. You will need an ISO file to run the Linux that you want though.

http://www.virtualbox.org/ looks good. And free.