In terms of
Beginner Guides, this is the closest thing I can find here. It ain't in Dutch, but oh well...
I'll have you know that Stage Hacking combines many aspects of Brawl Hacking. From Textures, to model imports, to animating said models, as well as some things that are Stage Hacking Specific. Like Collision Data, and SCN0s. If you're not familiar with any of these, you might as well get to know them.
