> For the complete documentation index, see [llms.txt](https://fusionauth.io/docs/llms.txt)

# Core Concepts

The fundamental concepts you need to know to use FusionAuth.

# Core Concepts

This section contains information about the most important concepts in FusionAuth.

## Fundamentals

[Applications](https://fusionauth.io/docs/get-started/core-concepts/applications.md)

[Users](https://fusionauth.io/docs/get-started/core-concepts/users.md)

[Tenants](https://fusionauth.io/docs/get-started/core-concepts/tenants.md)

[Oauth Scopes](https://fusionauth.io/docs/get-started/core-concepts/scopes.md)

## Relationships

[Roles](https://fusionauth.io/docs/get-started/core-concepts/roles.md)

[Groups](https://fusionauth.io/docs/get-started/core-concepts/groups.md)

[Registrations](https://fusionauth.io/docs/get-started/core-concepts/registrations.md)

[Entity Management](https://fusionauth.io/docs/get-started/core-concepts/entity-management.md)

[Types & Relationships](https://fusionauth.io/docs/get-started/core-concepts/types-and-relationships.md)

## Login

[Identity Providers](https://fusionauth.io/docs/get-started/core-concepts/identity-providers.md)

[Authentication & Authorization](https://fusionauth.io/docs/get-started/core-concepts/authentication-authorization.md)

[Integration Points](https://fusionauth.io/docs/get-started/core-concepts/integration-points.md)

## Licensing

[Licensing](https://fusionauth.io/docs/get-started/core-concepts/licensing.md)

[Features](https://fusionauth.io/docs/get-started/core-concepts/plans-features.md)

[Premium Features](https://fusionauth.io/docs/get-started/core-concepts/premium-features.md)