> For the complete documentation index, see [llms.txt](https://docs.lucernahealth.com/guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lucernahealth.com/guide/insights-studio/population-builder/reference-guides.md).

# Reference Guides

Text guides to help you understand and use Population Builder more effectively

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#### Orientation

[What is a Population Builder](/guide/insights-studio/population-builder/reference-guides/welcome-to-population-builder.md)

[Exploring Populations](/guide/insights-studio/population-builder/reference-guides/exploring-populations.md)&#x20;

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#### Key Concepts

[Glossary of key terms](/guide/insights-studio/population-builder/reference-guides/glossary-of-key-terms.md)

[What is a block ](/guide/insights-studio/population-builder/reference-guides/what-is-a-block.md)

[Data model, root table and golden table](/guide/insights-studio/population-builder/reference-guides/data-model-root-table-and-golden-tables.md)

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#### Building blocks

[Building your first block](/guide/insights-studio/population-builder/reference-guides/how-to-build-blocks.md)&#x20;
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#### Building populations

[Building a simple population](/guide/insights-studio/population-builder/reference-guides/how-to-build-populations.md)

[Building a complex population ](/guide/insights-studio/population-builder/reference-guides/how-to-build-complex-populations.md)

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#### Using populations

[Using populations](/guide/insights-studio/population-builder/reference-guides/using-populations.md)
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#### FAQ

Common questions and troubleshooting
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