Welcome to vCampus! I would suggest three places to look:
and finally the OSIsoft Learning Channel on YouTube
@Vikrant: before you start your project with PI SDK, I would like to kindly invite you to analyze your data access needs and see which PI Data Access component is best suited for your project. For instance, the PI System has made a significant turn toward being asset-centric (rather than tag-centric) and as such, newer data access technologies (e.g. AF SDK, PI OLEDB Enterprise) may be more appropriate than the PI SDK.
If you can describe your environment, scenario, requirements, etc., we'll be able to steer you in the right direction.
this was indeed helpful, thanks.