Please share your experience.
Wow, that's a loaded question!
I don't feel I can give you any assistance however my experiences may do. I've been constructing sites since 1993 and realised rapidly what was required from my type of sites, basically company technical product brochure sites.
I used to experiment with trying different keywords, urls, headings etc to see how they worked in the various search engines at that time and rapidly became adept at learning what worked with each engine. This soon became noticed and I was approached by AltaVista, then #1, to help them in their research and algos. This I did for a couple of years and then in 1998 I was again approached to see if I would be interested in trying a new search idea ... by Google! Once again I did this for a couple of years and the rest of G's history is well-documented.
The easy answer to your questions is that I have never taken any lessons from anyone, it's all been my own experimentation of trial and error, and the only person I can think of who ever gave me any advice was the late tedster when I was experiencing a specific issure and it took the two of us a couple of months to resolve it. It was a Google algo update refinement that they never told anyone about.
I wouldn't have a clue of what to recommend or even where to go, good SEOs are worth their weight in gold and are very unlikely to give free courses or lessons, maybe not even paid ones, I simply don't know.
Many of the SEOs on this forum board are all self-taught and many are the grey side of 50+, I'm 67, therefore there were no such courses or lessons when we started out, however what I do know is that whatever it is they are teaching these days does not appear to be that good since I see many, many SEO mistakes on many websites ... sure they like nice and arty-fartly but as for SEO, many are diabolical.
I was actually asked by my county university a few years ago if I would give some lectures in SEO since one of my young apprentices was teaching them more about SEO in lessons than the "teacher" knew, I declined due to pressure of work.
It'll be interesting to read what other older-hands have to say.