I was reading "Delaware Incorporation Handbook", which I got free from a opt in offer. I have a book on agency managed services and the business processes, the book from Umbrella. I never have liked reading fantasy garbage. I don't buy many print books now, but I have one on funding called "Keys to the Vault" which was good. My most expensive book aside from courses purchaser was a book on FCC/FDA supplement copy, which went into detail about how to not raise red-flags with your supplement marketing; cost $250 or so from the publisher a long time ago. My first physical course I purchased off eBay for $70 around 2010 called Land for Pennies. Now days I am keeping busy in ways, so by taking action instead of reading about it I feel a step closer to $omething... No Ferrari yet though...
As far as courses go you want something recent, new is good. No need to go back to the 80s by visiting archived BBS txt files. I am wanting to put out my own content in the form of eBooks, I just got info graphic software too. Courses are a next logical step, just need to grab a couple case studies to prove validity of the methods to the public. I want to launch a mega course for $750 & sell the series in parts too. The costs are low, the profits good, but I don't want to be a fake guru so I would test it all and invest in Video. Where to sell though? Seems there are a lot of options of where to distribute, probably lots of them I am not even aware of. Got a couple working methods I feel now. Next book I want to read will be my own. Watch out! Bob Bly has had some good to the point eBooks that I have read too.