Hi Kranti,
A little tip in order to you can fit, learn in this community and to collaborate, you should do a little search in google or SCN, later if you don't have clear your doubt you should expose what things you have find out, and to relate your doubts about this. This forum is focused to solve practical issues and theoretical doubts that are not clear if you search in internet. With a little effort in your side you will can learn a lot in this forum and by yourself, l've learnt a lot here 
Regards.
