Many of them, better paying jobs. 
Probably basic financial skills, learning a budget and the like.
Jobs or entrepreneurship?
IDK about basic financial skills. Where do you draw the line between basic and beyond? Sometimes I feel like crying for people who didn't seek guidance or help at an earlier stage, and come to me with a specific issue, when there's so many simple things that could have been done over the years to put them in a better position now. Even without changing anything about their jobs and income.
What justification is there for a person who has been in business for himself previously, and then on a company payroll for over a decade, to have $0 in retirement savings.