No chances understanding how inpainting work...

After 2 hours of experimenting with PS, reading and watching all tutorials, github questions etc, I still am not able to figure out what should I need to do for an inpainting to work, it is implemented here extremely unintuitive, or I just am extremely dumb :(
I open an image I want to inpaint, check the inpaint in plugin, after what "Mask -- Paint White to Mask -- temporary" layer opens at 60% opacity over my picture. Should I paint white into this 60% Mask -- Paint White to Mask -- temporary layer? After this, which layer should I select?
Also random pictures appearing in plugin under Image and Mask are very confusing. The button "Generate more Inpaint", "Generate Inpaint" and "Generate inpaint" randomly changes from one to another, also sometimes green, sometimes red, what adds additional confusion. And the worst nightmare is when after pressing the button you see 10 layers in PS appearing and some of them disappearing without any understandable intuition. Surely, inpainting sometimes works, but extremely randomly with random results.
Explain, please, in ELI5 terms, how should we do inpainting here?
I was waiting for a PS Stable Diffusion plugin, as the old one (Stable.art) has very few options, but with this kind of confusing implementation, it is a pity, I still have to work with Krita's plugin.