Which Areas Are Worth Focusing on for AWS DOP-C02?

I'm starting to work through the AWS Certified DevOps Engineer - Professional (DOP-C02) exam and I'm realizing that the preparation can get broad pretty quickly. There are several areas to understand, from CI/CD and infrastructure automation to monitoring, incident response, and security, so I'm trying to figure out where to spend the most time.

One thing I'm trying to avoid is simply going through service documentation and assuming that I know the material. I think it makes more sense to understand how the different AWS services fit into actual DevOps workflows, especially when it comes to deployment strategies, troubleshooting, automation, and resilient environments.

After reviewing the main topics, I'm planning to use DOP-C02 practice questions to check how well I can apply what I've studied and identify areas that still need work. I find question-based practice useful because it can expose gaps that aren't always obvious when you're just reading through the documentation.

For those who have prepared for DOP-C02, which area took the most effort for you? Did you spend more time on CI/CD and automation, troubleshooting and monitoring, or the resilience and security side of the exam?