# Docs

- [Key concepts](https://docs-lunar.earthly.dev/docs/key-concepts.md): Overview of Lunar's core concepts — domains, components, collectors, catalogers, policies, and checks — and how they fit together.
- [Component JSON](https://docs-lunar.earthly.dev/docs/component-json.md): How the Component JSON aggregates SDLC metadata deltas from collectors into a single object that policies evaluate against.
- [Catalog JSON](https://docs-lunar.earthly.dev/docs/catalog-json.md): Structure and precedence rules for the Catalog JSON, which merges domains and components from catalogers, lunar.yml, and lunar-config.yml.
- [Lunar CLI Reference](https://docs-lunar.earthly.dev/docs/lunar-cli.md): Complete reference for every Lunar CLI command, subcommand, flag, and environment variable across collectors, catalogers, policies, and Hub operations.


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