Flat to Star Transformation using DAX Query

As I have started working with clients around training/consulting, I am surprised by how often I find FlatToStar_RockyIVtables that have been flattened, i.e. the data tables have been combined (joined) with lookup tables, to produce a really wide table with everything and the kitchen sink in it. Maybe that's to be expected; after all that is the modus operandi when working in Excel. That's the first habit that I try to break. I would nominate this for the top 5 mistakes but that already has 6 on the list