So what is your experience, where do you find these informations and where do you get the most value for your money? Is it worth to pay 10x more for online courses than for books, and 10x more for coaches than for online courses?
And what are other good sources? Spying on competition, reverse engineering their sales funnels?
And what about testing everything for yourself? It can be very expensive, slow and there is no guarantee to find the solution.
Have you tried some mastermind groups? Where do you find good coaches? I think if you find somebody who has been there and done that already, it is cheaper to pay him few hundred or few thousand dollars and save even more time and money.
There are also opportunity costs, because you can start making money instead of trying to figure it out.