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

# Key Concepts

- [Application Statuses](https://help.rentzap.com/help-docs/key-concepts/application-statuses.md)
- [Listing Statuses](https://help.rentzap.com/help-docs/key-concepts/listing-statuses.md)
- [First In First Out Queue](https://help.rentzap.com/help-docs/key-concepts/first-in-first-out-queue.md)
- [Regional Rules](https://help.rentzap.com/help-docs/key-concepts/regional-rules.md)