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

# Concepts

- [What are Traits?](https://docs.playground.ooo/degen-engine/concepts/what-are-traits.md): The Atomic Layer of NFTs
- [Ownership and Transfers of Traits](https://docs.playground.ooo/degen-engine/concepts/what-are-traits/ownership-and-transfers-of-traits.md): In the world of NFTs, ownership of underlying assets is crucial. With Traits as the foundational layer of NFTs, the concept of ownership and transfers takes on a new perspective.
- [Verified Traits](https://docs.playground.ooo/degen-engine/concepts/what-are-traits/verified-traits.md)
- [Artist Royalties](https://docs.playground.ooo/degen-engine/concepts/what-are-traits/artist-royalties.md)
- [Media](https://docs.playground.ooo/degen-engine/concepts/media.md)
- [Rendering](https://docs.playground.ooo/degen-engine/concepts/rendering.md)
- [Access Controls](https://docs.playground.ooo/degen-engine/concepts/access-controls.md)