The AWS Certified DevOps Engineer - Professional exam validates technical expertise in provisioning, operating, and managing distributed application systems on the AWS platform. Exam concepts you should understand for this exam include the ability to:

Implement and manage continuous delivery systems and methodologies on AWS
Understand, implement, and automate security controls, governance processes, and compliance validation
Define and deploy monitoring, metrics, and logging systems on AWS
Implement systems that are highly available, scalable, and self healing on the AWS platform
Design, manage, and maintain tools to automate operational processes