# Core concepts

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