# Essentials

- [Register local modules](./register-local-modules.md)
- [Register routes](./register-routes.md)
- [Register navigation items](./register-nav-items.md)
- [Register deferred navigation items](./register-deferred-nav-items.md)
- [Register MSW request handlers](./register-msw-handlers.md)
- [Fetch public global data](./fetch-public-global-data.md)
- [Fetch protected global data](./fetch-protected-global-data.md)
- [Fetch page data](./fetch-page-data.md)
- [Use the logger](./use-logger.md)
- [Use the event bus](./use-event-bus.md)
- [Use environment variables](./use-env-variables.md)
- [Use feature flags (with LaunchDarkly)](./use-feature-flags.md)
- [Set Honeycomb custom attributes](./set-honeycomb-custom-attributes.md)
- [Localize resources](./localize-resources.md)
- [Register plugins](./register-plugins.md)
- [Define error boundaries](./define-error-boundaries.md)