Both and anyone. Please and thank you! I am here to learn and pursue the hobby. Keyboard commando is what inkjunkie called it, but that's what I am. Retired from submarines so I have bought the magazines, the books (for deployment), and now I have time to really pursue the hobby.
(I bet that might be the majority of people/readers/lurkers that will later read these posts are similar, they are unfamiliar with the tech.)
I don't have your (perhaps most contributors here) experience which is far above magazine sales, snake oil, etc.
I bought and read David Vizard's books and he barely covers specific techniques and broadly expounds on processes. He covers concepts and scientific generalizations without the specific explanations of how to do performance gains. He makes some grandious claims with his SBC, BBC, and SBF builds-questionably high numbers.
I don't give a **** about how little I know (or mind illustrating my ignorance of this craft), I love this hobby and have greatly succeeded elsewhere in life so I don't have anything to prove. You guys have done the leg work, and if I could, I would happily learn everything you would share. I have one flaw that greatly pisses off rustyratrod, maybe others. Sometimes people share information and I question it (because I want to learn/not to challenge, but that's how it is often received) because it might contradict something I read (often from a magazine or less reputable source) elsewhere. Thanks to everyone here for their contributions. Thank you very much!