> For the complete documentation index, see [llms.txt](https://docs.umbraco.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.umbraco.com/umbraco-cms/understand-umbraco-cms.md).

# Understand Umbraco CMS

- [Product and Releases](https://docs.umbraco.com/umbraco-cms/understand-umbraco-cms/product-and-releases.md): Track current releases, test upcoming versions, and find resources for older versions.
- [Pre-Release Guide](https://docs.umbraco.com/umbraco-cms/understand-umbraco-cms/product-and-releases/release-candidate-guide.md): Learn how to start testing a pre-release for the latest version of Umbraco CMS, and find information about new and updated documentation.
- [Legacy Documentation](https://docs.umbraco.com/umbraco-cms/understand-umbraco-cms/product-and-releases/legacy-documentation.md): Resources and links for older versions of Umbraco CMS.
- [Community and Contribution](https://docs.umbraco.com/umbraco-cms/understand-umbraco-cms/community-and-contribution.md): Connect with the Umbraco community and find ways to contribute to the project and documentation.


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