How to Add a Drop Down List in Excel That Updates Itself
Add a drop-down list in Excel with Data Validation, make it update itself from a Table, build dependent lists, and fix a dropdown that stopped working.
Excel
How to Use VLOOKUP in Excel (And Why It Returns #N/A)
Use VLOOKUP in Excel with exact match, understand why it only looks right, fix #N/A errors, and know when XLOOKUP or INDEX MATCH is the better choice.
How to Unhide Columns in Excel (Including Column A)
Unhide columns in Excel, reveal column A when the normal method fails, and fix the cases where Unhide does nothing because they were never hidden.
How to Merge Cells in Excel (And Why You Usually Shouldn’t)
Merge cells in Excel, see what merging breaks in sorting and pivots, and use Center Across Selection for the same look without the problems.
How to Remove Duplicates in Excel (Without Losing Data)
Remove duplicates in Excel, choose which columns define a match, find them safely first with UNIQUE or COUNTIF, and fix duplicates Excel cannot see.