Anybody knows about any reliable source where i can study Linux servers while sitting at my home. A single bit of information in this regards will be highly appreciated. thanks 
Yes. VirtualBox plus CentOS equals RHEL-like environment to play around, for free.
Or did you mean something like the official Red Hat Manuals.
If neither of these options fit your bill, please be more specific on what you need.
Hi pludi !
Actually I am looking for reliable RHCE Videos lectures resources.. also some good tutorials of RHCE Servers. thanks 
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get this book and a copy of CentOS and Virtualbox like described.
It is one of the better books I have read on the subject. It appears as though Amazon does not have an ebook, but you could see if another place might have it in electronic format. Otherwise, the book itself is likely going to be invaluable.