> For the complete documentation index, see [llms.txt](https://ferp.mrbarry.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ferp.mrbarry.com/understanding-effects-in-ferp.md).

# Understanding Effects in Ferp

- [What is a Ferp Effect?](https://ferp.mrbarry.com/understanding-effects-in-ferp/what-is-a-ferp-effect.md)
- [Core Effects](https://ferp.mrbarry.com/understanding-effects-in-ferp/core-effects.md): The basic effects that Ferp provides to help you build better software
- [Composing Custom Effects](https://ferp.mrbarry.com/understanding-effects-in-ferp/custom-effects.md)
- [Testing Your Effects](https://ferp.mrbarry.com/understanding-effects-in-ferp/testing-your-effects.md)