> For the complete documentation index, see [llms.txt](https://sdk.zello.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sdk.zello.com/core-concepts.md).

# Core Concepts

- [Network Credentials](https://sdk.zello.com/core-concepts/network-credentials.md)
- [User + Channel Provisioning](https://sdk.zello.com/core-concepts/user-+-channel-provisioning.md)
- [Background Work + Push Notifications](https://sdk.zello.com/core-concepts/background-work-+-push-notifications.md)
- [Permissions](https://sdk.zello.com/core-concepts/permissions.md)
- [Advanced Networking + Security](https://sdk.zello.com/core-concepts/advanced-networking-+-security.md)
- [Android Firebase Integration](https://sdk.zello.com/core-concepts/android-firebase-integration.md)