WHAT IS DEVELOPMENTAL EDITING? And the open market for non-fiction developmental

WHAT IS DEVELOPMENTAL EDITING?
https://thewritepractice.com/developmental-editing/

And the open market for non-fiction developmental editing. For me at least, my editor is a collaborator. Because there is a vast difference between solving a hard problem and explaining a solution and why it matters. https://t.co/9fOYTZSii6