Stop losing your manual Excel edits during data updates with this guide to preserving custom columns in Power Query.

One of the first things I learned about Power Query—and a rule I still follow religiously today—is to not select a column and delete it. To build a truly resilient dashboard, you must instead tell the ...

We've all been there: struggling with a nested Excel formula that breaks when your data shifts, or using Flash Fill only to find it missed half the rows. I stopped relying on those fragile workarounds ...