Nagios

Git Flow's branch model compared against trunk-based development with short-lived feature branches and feature flags — with a decision framework.

compose.yaml services, networks, volumes, environment files, healthchecks, and dependency ordering for a real app + database + cache stack.

The Pod as the atomic unit, Deployments for replica management and rollouts, and Services (ClusterIP/NodePort/LoadBalancer) for stable networking.

The Linux fundamentals every DevOps engineer needs before touching infrastructure.

Version control fundamentals — commits, branches, and merges.