Hello Vani,
Kindly use below official tutorials from SAP
SAP Product Tutorials
SAP BusinessObjects Dashboards http://scn.sap.com/docs/DOC-7946
SAP BusinessObjects Web Intelligence http://scn.sap.com/docs/DOC-7819
SAP BusinessObjects BI Launch Pad 4.x http://scn.sap.com/docs/DOC-19231
SAP BusinessObjects Information Design Tool http://scn.sap.com/docs/DOC-8461
SAP BO BI Suite http://scn.sap.com/docs/DOC-7725
Regards,
Atul Bhimrao Divekar.