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

# Fundamentals

- [Getting started](https://docs.aurelia.io/getting-to-know-aurelia/aurelia-router/fundamentals/getting-started.md)
- [Router configuration](https://docs.aurelia.io/getting-to-know-aurelia/aurelia-router/fundamentals/router-configuration.md): Learn about configuring the Router.
- [Defining routes](https://docs.aurelia.io/getting-to-know-aurelia/aurelia-router/fundamentals/configuring-routes.md): Learn about configuring routes in Router.
- [Child routing playbook](https://docs.aurelia.io/getting-to-know-aurelia/aurelia-router/fundamentals/child-routing.md): Build deeply nested navigation trees with Aurelia's router, including layouts, sibling viewports, and relative navigation.
- [Route parameters](https://docs.aurelia.io/getting-to-know-aurelia/aurelia-router/fundamentals/route-parameters.md): Declare, read, and validate route parameters in Aurelia's router, including required, optional, wildcard, and constrained segments.
- [Viewports](https://docs.aurelia.io/getting-to-know-aurelia/aurelia-router/fundamentals/viewports.md): Learn about viewports in Aurelia router and how to create complex layouts with hierarchical and sibling viewports.


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