Owner of Determined Solutions SEO ( https://determinedsolutions.com ). Everything I know about search comes from experience building my own businesses and my clients.
Not theories or articles in fancy trade publications. Experience in SEO, and most other endeavors, is the best teacher.
Because of my Experience with doing SEO for dentists, when real time online scheduling for dentists was invented, I saw the opportunity to combine the two.
Driving massive amounts of traffic to a dentist, then placing their open schedule online, making it as easy to book an appointment as it is to buy a plane ticket, means I print money for the dentists I work with.
Through experience and a bit of luck, I invented the only real Dental SEO.
But that's just the dental niche.
I also operate in the Ecom, sport fishing, dog breeding, luxury home furnishing, mold removal, dating, CPR training, vacation planning, psychotherapy, Shopify, Local SEO, and several other niches.