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> It's a skill that can be learned like every other skill. You can take the "in 21 days" route or the MOOC / University course route

Sorry, what did you mean by "in 21 days route"? Also, do you have any MOOC on doing business to recommend?

There's a trope of technology learning books whose titles fit the pattern "Teach yourself X in 21 days".

the 21 days are in reference to Peter Norvig's article: http://norvig.com/21-days.html