Business Intelligence is not about the tool or platform. In order to become a successful BI developer, you first of all need a deep understanding of the business and the company that you are working for. Second, you need to understand the toolset that you are working with. Third, is about choosing the right tool for the task; there is not one tool that solves all issues. Be pragmatic; use the entire toolbox available to you. Put the logic where it makes most sense, sometimes, it is best to add it to the database, in other cases, the best choice is to put it into the analysis model. And sometimes, it is best to add it to the end-user report.
Hopefully, this book has given you a kick-start on the track of becoming a BI developer; to become successful, the best advice that I want to end this book with is to never stop learning.
"The wisest mind has something yet to learn."
George Santayana