Salesforce CRT-403 - Salesforce Prepare for your Platform App Builder Certification Certification Exam

A validation rule is a formula that evaluates the data in one or more fields and returns a value of “True” or “False”. Validation rules verify that the data a user enters in a record meets the standards you specify before the user can save the record. In this case, a validation rule can be used to check if the Expected_Close_Date_c field is populated before the Opportunity stage is set to qualified 

The lead settings have an option to require validation for converted leads. If this option is unchecked, then the Account validation rules will not be enforced when a lead is converted to an Account. This could result in missing or incorrect information on the Account records

Standard buttons can be overridden with a Visualforce page to provide custom functionality or user interface. For example, you can override the New button on an object to display a custom Visualforce page instead of the standard page layout3. Standard buttons that are not available for overrides can still be hidden on page layouts to prevent users from accessing them. For example, you can hide the Delete button on an object to prevent users from deleting records

A formula field is a read-only field that derives its value from a formula expression you define. The formula field is updated when any of the source fields change. You can use formula fields to display based on certain conditions. In this case, a formula field can be used to display a green, yellow, or red circle image based on the case age.

An AppExchange solution is a pre-built application or component that can be installed from the Salesforce AppExchange, which is an online marketplace for Salesforce products. AppExchange solutions can help you meet your business needs quickly and efficiently, without requiring much development effort or expertise. You can browse and search for AppExchange solutions by category, industry, rating, price, and more.