The ACE exam is organised around the tasks of a cloud engineer rather than fixed-weight domains. This is a plain-English summary; the official Google Cloud exam guide is authoritative.
Setting up a cloud solution environment
Creating and managing projects and billing, configuring IAM, and setting up the gcloud CLI and Cloud Shell.
Planning and configuring a cloud solution
Planning compute, storage and network resources for a workload, and estimating and managing cost.
Deploying and implementing a cloud solution
Deploying with Compute Engine, Google Kubernetes Engine (GKE), Cloud Run and App Engine, plus Cloud Storage and managed databases and data services.
Ensuring successful operation
Monitoring, logging and alerting with Cloud Operations, and managing and maintaining running resources.
Configuring access and security
IAM roles (basic, predefined, custom), service accounts, and least-privilege access.