The Salesforce Platform App Builder credential is designed for individuals who would like to demonstrate their skills and knowledge in designing, building, and deploying custom applications using the declarative customization capabilities of the Lightning Platform. The candidate can create, manage, and update data models, application security, business logic, and process automation.

Here are some examples of the concepts you should understand to pass the exam:

How to design the data model, user interface, business logic, and security for custom applications

How to customize applications for mobile use

How to design reports and dashboards

How to deploy custom applications