Anyone who works with spreadsheets for more than a few days eventually runs into the same quiet problem. You build a sheet, formulas are correct, totals match, everything looks clean, and then one small accidental edit breaks the whole thing. This is exactly why learning How to Lock Cell in Excel matters more than people realize. It is not an advanced trick reserved for analysts. It i... https://budgetexcel.com/how-to-lock-cell-in-excel/