Hi Sumesh,
you can purchase the book from Universe Design with SAP BusinessObjects BI. The Comprehensive Guide of Christian Ah-Soon, Didier Mazoué, Pierpaolo Vezz…
It is a good read, if you want to attend 5 day course, you can take this online course https://training.sap.com/shop/course/boid10-sap-businessobjects-information-design-tool-classroom-015-us-en/
Happy learning!
Shankar