1. Buy the book - Exam Ref 70-778 Analyzing and visualizing data by using Microsoft Power BI by Danill Maslyuk
2. prepare by solving quiz and watching videos.
3. You can take an online course from different websites. or from any institute.
https://www.edureka.co/ - Edureka
https://www.edx.org/course/analyzing-and-visualizing-data-with-power-bi-2 - EDX
https://docs.microsoft.com/en-us/power-bi/guided-learning/ - Microsoft
Hope this helps you
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