devkitPro

I'm trying to learn to use the citro2d and citro3d libraries. I have been looking around for a while now but I can not find documentation of these libraries anywhere, just examples. Can anyone tell me where I should look to learn?

citro2d documentation can be found here: https://citro2d.devkitpro.org/
citro3d documentation on the other hand doesn't exist; like you pointed out only examples are available.