> For the complete documentation index, see [llms.txt](https://tutorial.specian.co.uk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tutorial.specian.co.uk/backend/conclusion.md).

# Conclusion

This is now the end of this chapter. 

We covered the following concepts:

* Organising your files in a scalable way.
* Reading secrets from environment variables.
* Managing different configurations based on your environments.
* How to use Express and GraphQL together.
* How to build a strongly typed GraphQL API.
* How to add an extra layer on security.
* Connecting to the database.
* Mocking database interaction and the GraphQL server.
* User authentication.

If you have any questions, feel to reach me on Twitter [@florianherrengt](https://twitter.com/florianherrengt).

Want to hire us? [Let's chat.](https://calendly.com/florianherrengt/15min)