> For the complete documentation index, see [llms.txt](https://erroldrummond.gitbook.io/halo2-tutorial/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://erroldrummond.gitbook.io/halo2-tutorial/section-3.md).

# Section 3

- [Gadgets](https://erroldrummond.gitbook.io/halo2-tutorial/section-3/gadgets.md)
- [Range gadget](https://erroldrummond.gitbook.io/halo2-tutorial/section-3/range-gadget.md)
- [ECDSA gadget](https://erroldrummond.gitbook.io/halo2-tutorial/section-3/ecdsa-gadget.md)
- [Conclusion](https://erroldrummond.gitbook.io/halo2-tutorial/section-3/conclusion.md)