I have a friend that is a 3D designer and wants to join the Stack Exchange network. We have seen different sites like hardware, English grammar and so on.
Is there any site appropriate for a 3D Developer?
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I think with "sections" you mean the different Stack Exchange sites; they're other Q&A sites using the same engine that Stack Overflow does.
There is a Stack Exchange site for Blender, if you're willing to use a site that is specific to one specific piece of software.