Apply data validation to cells

What is Data Validation? Overview, Types, and Examples

Data Validation: Overview, Types, How to Perform | Built In

Add tick/ cross into your Data Validation and use it in IFs and Conditional Formatting

Enable Conditional Data Entry in Excel using Data Validation

Data Validation Custom Formulas

Data Validation: Techniques, Types, and Best Practices

Data Validation Testing | Tools and Techniques

3 Best Practices for Automating Validation of Data