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When creating a new Aurora-subtheme, you will have a particular folder structure inside the partials folder where there are the base, design and global folders, with one or more files in each. Sadly, there's little explanation on how these are supposed to be used. The files in the base folder are kinda obvious, as are forms and type.scss, but the rest of them are hard to tell the purpose of.
Conventions are a good thing, I think it'd be a great thing if the use of these folders where explained just a tiny bit more.