Reecha,

Force.com version 6 and version 8 are having the same fundamental building blocks of the force.com platform but version 8 may be having latest UI changes for the latest Release. So I would suggest to follow the version 8 which is found at

http://www.salesforce.com/us/developer/docs/fundamentals/salesforce_creating_on_demand_apps.pdf

Thanks.
Velmani Natarajan

Reecha,

The link provided by Velmani should be used as it have all latest UI changes, I have already made a note to the administrator to update the link in Dezyre portal, once the new link is posted, will update you all.

Thanks
Ahmed

Force.com Platform Fundamentals
An Introduction to Custom Application Development in the Cloud
Version 9, January 2015

http://www.salesforce.com/us/developer/docs/fundamentals/salesforce_creating_on_demand_apps.pdf