Hi Naveen,
Perhaps if you gave some more details on what you are looking for we could be more helpful. Are you working on a project and want to make sure that the implementation goes well? Are you trying to self educate on SAP in order to get a job? What is your role? Are you a project manager, a functional configurator, a technical person or ...?
My best advice, given the information we have, is for you to look for a good book on SAP. SAP Press puts out many excellent books that give context and best practices. You can get them directly from SAP Press or from any other online book seller or even your local bookstore (or a library).
I hope this helps! If you respond with some clarification, perhaps the community will be able to help you zero in more specifically on something that targets your exact focus.
Best regards,
--Tom