Don"t know about the best but one worth looking into is by Kevin Davey, reason being his audited trading statement is available so its likely to be a profitable method.
Most gurus & courses do not back up their claims with audited trading statements, this is because their methodology does not work period ... not matter how disciplined you are and how effective your money management is you will lose your account slowly but steadily over time trading them
First thing you need is a profitable methodology which is hard to find, then when you have that you need effective money management which is harder to develop (simply risking 2% of your account is not the answer) & once you have these two things you need the right psychological mindset which is extremely difficult to develop
Even if you can get all three of the above you still need a well capitalized account to make it worth your while or you need to trade other people money.
Realistically speaking becoming a doctor is probably an easier goal to achieve