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

# Getting Started

- [Introduction](https://docs.three.dev/getting-started/readme.md)
- [Glossary / Core Concepts](https://docs.three.dev/getting-started/glossary-and-core-concepts.md): Core terminology for three.dev — use cases, sessions, experiments, assessments, prompts, and quality metrics.
- [Quickstart: Record your requests](https://docs.three.dev/getting-started/quickstart-record-requests.md): Set up the three.dev proxy to record your LLM requests for observability and experimentation.
- [Quickstart: Run an offline experiment](https://docs.three.dev/getting-started/quickstart-run-offline-experiment.md): Create your first offline experiment — replay historical requests, review AI Judge scores, and assess a sample to reach statistical confidence.
- [Quickstart: Run a live experiment](https://docs.three.dev/getting-started/quickstart-run-live-experiment.md): Run a live experiment to test AI configuration changes on production traffic with statistical rigor.


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