YAML & Config File Fundamentals

Summary

YAML is the near-universal configuration format across DevOps tools — CI/CD pipelines, Kubernetes manifests, Ansible playbooks — understanding its indentation-sensitive syntax prevents a huge share of frustrating errors.

• 1Write a small YAML file and validate it with an online or CLI YAML linter.
• 2Learn common YAML pitfalls: inconsistent indentation, tabs vs spaces, and quoting rules.
• 3Compare the same configuration expressed in YAML versus JSON to see the readability trade-off.