# References

> Detailed information and list: supported OS distros, available modules, monitor metrics, extensions, cost compare & analysis, glossary
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Section pages:

- [Compatibility](/docs/reference/compatibility/): Supported operating systems, kernels & arch, PostgreSQL major versions and feature sets.
- [Parameters](/docs/reference/param/): Pigsty has 280+ parameters to describe every aspet of the environment & various modules
- [Extension List](/docs/reference/extension/): List of PostgreSQL extensions supported by Pigsty, and their compatibility on different OS distros.
- [File Hierarchy](/docs/reference/fhs/): How files are organized in Pigsty, and directories structure used by modules
- [Comparison](/docs/reference/compare/): Comparing products such as RDS and projects that has feature overlap with Pigsty
- [Cost Analysis](/docs/reference/cost/): RDS / DBA Cost reference to help you evaluate the costs of self-hosting database
- [Glossary](/docs/reference/glossary/): technical terms used in the documentation, along with their definitions and explanations.