> 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/master/concepts.md).

# CONCEPTS

- [STORE](https://www.ngxs.io/master/concepts/store.md)
- [Store Schematics](https://www.ngxs.io/master/concepts/store/schematics.md)
- [Store Options](https://www.ngxs.io/master/concepts/store/options.md)
- [Error Handling](https://www.ngxs.io/master/concepts/store/error-handling.md)
- [Meta Reducers](https://www.ngxs.io/master/concepts/store/meta-reducer.md)
- [ACTIONS](https://www.ngxs.io/master/concepts/actions.md)
- [Action Schematics](https://www.ngxs.io/master/concepts/actions/schematics.md)
- [Actions Life Cycle](https://www.ngxs.io/master/concepts/actions/actions-life-cycle.md)
- [Actions Stream](https://www.ngxs.io/master/concepts/actions/actions-stream.md)
- [Cancellation](https://www.ngxs.io/master/concepts/actions/cancellation.md)
- [Dynamic Action Handlers](https://www.ngxs.io/master/concepts/actions/dynamic-action-handlers.md)
- [Monitoring Unhandled Actions](https://www.ngxs.io/master/concepts/actions/monitoring-unhandled-actions.md)
- [STATE](https://www.ngxs.io/master/concepts/state.md)
- [State Schematics](https://www.ngxs.io/master/concepts/state/schematics.md)
- [Life-cycle](https://www.ngxs.io/master/concepts/state/life-cycle.md)
- [Composition](https://www.ngxs.io/master/concepts/state/composition.md)
- [Lazy Loading](https://www.ngxs.io/master/concepts/state/lazy.md)
- [State Operators](https://www.ngxs.io/master/concepts/state/operators.md)
- [Custom State Operators](https://www.ngxs.io/master/concepts/state/operators-1.md)
- [Shared State](https://www.ngxs.io/master/concepts/state/shared-state.md)
- [State Token](https://www.ngxs.io/master/concepts/state/token.md)
- [Immutability Helpers](https://www.ngxs.io/master/concepts/state/immutability-helpers.md)
- [Error Handling](https://www.ngxs.io/master/concepts/state/error-handling.md)
- [Sub States](https://www.ngxs.io/master/concepts/state/sub-states.md)
- [SELECT](https://www.ngxs.io/master/concepts/select.md)
- [Mapped Sub States](https://www.ngxs.io/master/concepts/select/mapped-sub-states.md)
- [Optimizing Selectors](https://www.ngxs.io/master/concepts/select/optimizing-selectors.md)
- [Type-Safe Selectors](https://www.ngxs.io/master/concepts/select/type-safe-selectors.md)
- [Selector Utils](https://www.ngxs.io/master/concepts/select/selector-utils.md)
- [Error Handling](https://www.ngxs.io/master/concepts/select/error-handling.md)
- [Signals](https://www.ngxs.io/master/concepts/select/signals.md)
- [Select Decorator](https://www.ngxs.io/master/concepts/select/select-decorator.md)