> For the complete documentation index, see [llms.txt](https://docs.connext.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.connext.network/developers/guides.md).

# Guides

- [Frontend](https://docs.connext.network/developers/guides/sdk-frontend-integration.md)
- [SDK](https://docs.connext.network/developers/guides/sdk-guides.md)
- [Estimating Fees](https://docs.connext.network/developers/guides/estimating-fees.md)
- [Tracking xCalls](https://docs.connext.network/developers/guides/xcall-status.md)
- [Authentication](https://docs.connext.network/developers/guides/authentication.md)
- [Handling Failed xCalls](https://docs.connext.network/developers/guides/handling-failures.md)
- [Nested xCalls](https://docs.connext.network/developers/guides/nested-xcalls.md)