Implement Best Practices | Validation Rules | Formulas Superbadge Unit 

Learning Objectives
After completing this unit, you’ll be able to:
Design user-friendly validation rules.
Create validation rules that consider existing data.
Make Your Validations User-Friendly
Think of error messages as guideposts that help users navigate your validation rules. Here’s an example of an effective error message for the Amount field.
When the stage is Qualification or higher, you must enter an amount. [OPP003]
Let’s take a closer look at why this error message works, and what you can do to make your error messages just as effective.