I think the ability to manage money well and not get screwed over by credit facilities is highly correlated with ones level of trait conscientiousness. It's less about skills per se than it is about that particular trait. I would wager those high in trait conscientiousness naturally tend towards frugality and budgeting and those low in trait conscientiousness tend towards impulse buys and poor financial planning.

My wife is 99th percentile for trait conscientiousness and I'm 1st percentile. I'm amazed at the amount of money she's able to save and her level of discipline and she's generally gobsmacked at the amount of money I waste and the random shit I buy.

Having the information about what one should or shouldn't do is only part of the equation. 8t also needs to be something you can apply, and sadly some of us just can't.