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

# Advanced Concepts

- [Adding Custom Embeddings](https://legacy-docs.aquariumlearning.com/aquarium/concepts/adding-custom-embeddings.md): Add custom embeddings to your uploads
- [Dataset Checkpoints](https://legacy-docs.aquariumlearning.com/aquarium/concepts/dataset-checkpoints.md): Use checkpoints to manage versions of your dataset over time and measure the impact of improving data quality or acquiring new data.
- [Collection Campaign Classifier](https://legacy-docs.aquariumlearning.com/aquarium/concepts/collection-campaign-classifier.md)
- [Embeddings](https://legacy-docs.aquariumlearning.com/aquarium/concepts/embeddings.md)
- [URL formatting](https://legacy-docs.aquariumlearning.com/aquarium/concepts/url-formatting.md)
- [Metrics Methodology](https://legacy-docs.aquariumlearning.com/aquarium/concepts/metrics-methodology.md)
- [Complex Label Class Maps](https://legacy-docs.aquariumlearning.com/aquarium/concepts/complex-label-class-maps.md)
- [Webhooks](https://legacy-docs.aquariumlearning.com/aquarium/concepts/webhooks.md): How to use Aquarium webhooks to communicate with your own services, including automating labeling service integrations.
- [Integrating with Labeling Using Webhooks](https://legacy-docs.aquariumlearning.com/aquarium/concepts/webhooks/integrating-with-labeling-using-webhooks.md)
- [Custom Metrics](https://legacy-docs.aquariumlearning.com/aquarium/concepts/custom-metrics.md)
- [Stratified Metrics](https://legacy-docs.aquariumlearning.com/aquarium/concepts/custom-metrics/stratified-metrics.md)
- [Troubleshooting](https://legacy-docs.aquariumlearning.com/aquarium/concepts/troubleshooting.md): Common error messages you may see and how to resolve them
- [Troubleshooting Common Web Issues](https://legacy-docs.aquariumlearning.com/aquarium/concepts/troubleshooting/troubleshooting-common-issues.md)