YAML (YAML)

YAML: the configuration format that’s “human-readable” until you get the indentation wrong and spend an hour debugging a missing space. YAML (YAML Ain’t Markup Language) is the lingua franca of DevOps configuration.

Kubernetes manifests? YAML. Ansible playbooks? YAML. Docker Compose? YAML. GitHub Actions? YAML. CI pipelines? YAML. Your will to live after debugging YAML? Also YAML, probably.

Why it matters: Love it or hate it, YAML is everywhere in DevOps. Mastering its quirks (yes, on is a boolean) is a survival skill for any DevOps engineer.