Yes, I know... Just requires some thought & organization. Did you not read the part about Thomas saying we would probably offer discounts, free licenses etc to people who provide (
good) tutorials, translations for the engine etc?
I don't think we would provide how to draw/paint scenes or create music - I know how to produce music but I still wouldn't provide help for that. I spent 5 years or so running a music production & promotion forum & indie record label (of sorts) & I can't be bothered delving back into that stuff again.

I think that would be left to other people, besides there's loads of stuff for drawing/painting (traditional & digital) on places like tuts+ which feature some nice step by step guides for game dev art if I remember correctly.
If we were to focus on anything particular then it would be the core mechanics of the editor. In other words the functions, the actions, how to setup a scene, or a character, or an environment animation, or the way system & so on.
Have you checked the wiki? I know it's still got a long way to go, but I'm one person & I have to work around my own stuff & time, but you can get an idea of what it will contain. My main priority is to add overviews of each section/tab & window, which explains what each button does or what each thing is for. I will be adding screenshots, annotated diagrams, & icons to certain parts of the wiki too, to further explain certain things.