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

# Core concepts

- [Forms](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/forms.md)
- [Validation](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/validation.md)
- [Using existing validators](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/validation/validators.md)
- [Adding custom validators](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/validation/custom-validators.md)
- [Configuration](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/configuration.md)
- [Price format](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/configuration/configuring-price-format.md)
- [Date format](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/configuration/configuring-date-format.md)
- [Performing API calls](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/api-requests.md)
- [Toggling visibility of components](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/visibility-condition.md)
- [Translations](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/translations.md)
- [Assets and documents](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/assets-and-documents.md)
- [Datasets](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/datasets.md)
- [Rules For Robust Application](https://docs.kasko.io/kasko-frontend-documentation/core-concepts/rules.md)