# Basics

- [MVU](/basics/mvu.md): Model-View-Update
- [Application state](/basics/application-state.md)
- [Commands](/basics/application-state/commands.md)
- [State validation](/basics/application-state/state-validation.md)
- [User interface](/basics/user-interface.md)
- [Widgets and modifiers](/basics/user-interface/widgets-and-modifiers.md): The building blocks of a declarative UI
- [Styling](/basics/user-interface/styling.md)
- [Animations](/basics/user-interface/animations.md)
- [Testing](/basics/testing.md)
- [Error monitoring](/basics/error-monitoring.md)