A Beginner's Guide to YAML for GitHub Actions Workflows

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YAML, which stands for 'YAML Ain't Markup Language,' is the file format powering every GitHub Actions workflow, stored under .github/workflows/ in a repository. Unlike XML or JSON, YAML uses no brackets or closing tags — structure is defined entirely through indentation and line breaks. This makes YAML highly readable but also fragile, as a single missing space can silently break a workflow without a clear error message. Key concepts include key-value pairs separated by a colon and space, nested mappings created through consistent two-space indentation, and lists denoted by a hyphen followed by a space. Mastering these three building blocks is enough to read and write functional CI/CD workflow files with confidence.

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