I'm not qualified to teach economics, either to little people or to big people, but I will suggest two books that will bring you up to the 90th percentile relative to all public school graduates.
The first is a thin volume from the 1940s that is easy enough to read and understand, even DUmmies should have little problem (if they would only read it!): Economics in One Lesson, by Henry Hazlitt.
The second is newer and thicker, but I am told by those who've read it (I haven't yet) very well-written and not at all technical: Basic Economics, by Thomas Sowell.
In neither of these books will you likely learn how to make more money, or how to get a promotion, or any other "how-tos." Economics doesn't teach that kind of stuff. You'll have to go to the investing or personal growth sections of the bookstore for that information.
Economics is more about what causes production, wealth, poverty and unemployment than how an individual can become rich.