> For the complete documentation index, see [llms.txt](https://www.ngxs.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.ngxs.io/v3.7/concepts.md).

# Concepts

- [Introduction](https://www.ngxs.io/v3.7/concepts/intro.md)
- [Store](https://www.ngxs.io/v3.7/concepts/store.md)
- [Actions](https://www.ngxs.io/v3.7/concepts/actions.md)
- [State](https://www.ngxs.io/v3.7/concepts/state.md)
- [Select](https://www.ngxs.io/v3.7/concepts/select.md)