Power Query Courses
SQLBits via YouTube Managing Blanks and Nulls in Power BI
SQLBits via YouTube Power Query in 20 Minutes - How it Works
SQLBits via YouTube Excel 365 for Teaching: Dynamic Arrays, XLOOKUP, Power Query and PivotTables
ExcelIsFun via YouTube Data Extract, Transform, and Load in Power BI
Microsoft via Coursera Power BI Basics - Full Course Tutorial for Beginners to Advanced Users
Learnit Training via YouTube Data Preparation in Power BI with the M Language
Pluralsight