AZ-900, where to start… Microsoft normally offers 1-day instructor-led training leading up to AZ-900. At least in Norway. Seems like a good place to start.
Top of mind tips on passing the exams required for getting the MCSA BI Reporting certification
Chapter 2 of Analyzing data With Microsoft Power BI and Power Pivot for Excel discuss the use of header/details tables in data modeling. Affiliate link
Short summary or key learnings from chapter 1 of Analyzing Data With Microsoft Power Bi and Power Pivot for Excel
A few weeks ago, I decided to get certified in Power BI. The closest certification I could find is the MSCA BI Reporting sertification from