The molecular unit of optimization is the sentence. Every single principle associated with optimizing any form of marketing can be understood, perhaps best understood, in the context of improving a sentence. A sentence represents the basic grammar of life. Entity exists; subject “predicates”.
My point is not to make an exhaustive list, but to demonstrate that by focusing on the art of creating a beautiful (read effective) sentence, one may learn the essential insights necessary to shaping any other form of communication. As Strunk and White espoused, “make every word tell.”