# Page Not Found

The URL `learn/welcome/security` does not exist.

You might be looking for one of these pages:
- [Security](https://docs.balena.io/learn/introduction/security.md)
- [Release strategy](https://docs.balena.io/learn/deploy/release-strategy.md)
- [Delta updates](https://docs.balena.io/learn/deploy/delta.md)
- [Define a container](https://docs.balena.io/learn/develop/dockerfile.md)
- [Data collected by balena](https://docs.balena.io/learn/more/collected-data.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://docs.balena.io/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://docs.balena.io/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/learn/introduction/security.md`)
- Use `Accept: text/markdown` header for content negotiation