Hello ram ram,
Kindly do a basic level of search before posting an question here.
BW has reached 7.4 SP10 and there are multiple changes /additions coming within each SP level.
You have lot of documents available in this space itself.
See if you have access to the following Open SAP course:
https://open.sap.com/courses/bwhana1
Please feel free to post your questions if you have doubts in any specific topic.
BR
Prabhith