# App

- [Design](/core-web-dev-concepts/app/design.md)
- [JavaScript](/core-web-dev-concepts/app/javascript.md)
- [Code design paradigms](/core-web-dev-concepts/app/code-design-paradigms.md)
- [State and Props](/core-web-dev-concepts/app/state.md)
- [JSON](/core-web-dev-concepts/app/json.md)
- [HTML templating](/core-web-dev-concepts/app/pug.md)
- [Testing](/core-web-dev-concepts/app/testing.md)