The Complete Excel Guide: Beginners to Advanced - Data Validation

The video tutorial covers data validation in Excel, focusing on creating dropdown lists to ensure data consistency and setting number restrictions with error messages. It also discusses protecting data validation lists by placing them on separate sheets and hiding them to prevent unauthorized changes.

Explain how to create an error alert for invalid data entry in Excel.

What precautions should be taken when using hidden sheets for data validation lists?

Discuss the importance of protecting data validation lists in Excel.