Could you please make some concept art content that uses Krita instead of Photoshop? At the very least, you could make the source files compatible with Krita, or make a tutorial about the differences between Photoshop and Krita.
I tend to agree that it would be nice to have tutorials about Krita. I would expect that it can open PSD's but not photoshop brushes right? Most of the concept tutorials I've seen are somewhat software agnostic once you have a handle on the software (I've done all my concept exercises in Clip Studio Paint instead of Photoshop but I was already familiar with it and it opens PSD's fine (though not Photoshop brushes)).
I do not utilize photoshop at all, but most of those .psd files are simply an image if I recall and have no layers at all? If so, then several of those could be made to simply a standard image format. Not sure about brushes, but those are primarily only a sort of grayscale with alpha as a texture in which case you could try to manually add those raw images to whatever you are using. Though I am not sure how extensible that concept is to many different software platforms.
I strongly recommend Krita's documentation, very complete and it covers most of the important topics.
https://dev.krita.org/en/learn/tutorials/
tbrbn It's not so much an explanation of this or that feature I'd like to see in a Krita tutorial; more of one that demonstrates like a workflow of a typical project with it.
FWIW, I *have* been able to work out on my own how to make this or that feature work in Krita; but having to figure out those things on top of practicing the art techniques makes some of the concept art courses take a bit more time than they otherwise would.