One Important Concept in PL-300: Pivot and Unpivot
Pivot means turning row values into columns.
Unpivot is the opposite: turning columns into rows
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This is a big development..wow!
I'm impressed and amazed as well. You just kinda answered the question I had in mind while writing my previous post.
I'm going to check every link you posted here out but is there something I should be mindful of while checking them out?
Pivot/Unpivot is one of those concepts that seems simple until you actually need it in production. I use the same pattern constantly when reshaping OHLCV crypto data — price feeds come in as wide tables (one column per asset) but most time-series analysis needs long format. Power Query's Unpivot makes that a one-click transform. Good luck with the PL-300 — the DAX filter context questions are the real trap on that exam.