Bitten by Power Query: a lesson about knowing our data, our tools and what can go wrong.
For a list of my Excel courses at Lynda/LinkedIn:
https://www.linkedin.com/learning/instructors/oz-du-soleil
There are courses on Power Query, Good spreadsheet habits, and a weekly Excel challenge that comes out every Friday.
Website: https://ozdusoleil.com
My book: Guerrilla Data Analysis 2nd Edition
My old blog: http://datascopic.net/blog-2-2