FREE COURSE · MODULE 6 OF 12 Data validation stops bad data before it reaches your formulas. Ten short chapters cover every rule type in the Data Validation dialog, from a simple drop-down list to formula-based rules, input messages and error alerts. 📚 14 chapters⏱ About 1 hour🖼 Screenshot for every step🎓 Beginner Start Chapter … Continue reading Data Validation in Excel: 14-Chapter Course with Drop-Down Lists and Custom Rules