Three other family members and myself have at almost the same time and for completely different reasons became interested in or needed to become acquainted with image art of some form.
I wanted to find “The Tutorial” to share with everyone so we could relate bettter.
Krita does not need a tutorial before using. If you don’t know about a specific subject about Krita, e.g. reference image, just watch a random video on YouTube.
Also check out their official documentation. https://docs.krita.org/en/user_manual.html
And this community. https://krita-artists.org/
There are also training materials (art, not software) you can buy while supporting the project. https://krita.org/en/shop/
That’s not the point. You can say the same about Blender, etc.