My book “Getting it Together” has been written specifically for younger people, but some large companies are including it in their staff training kit for staff up to age 30. It is 80% motivational (it teaches people how to be successful) and the other 20% is about the fundamentals of finance.
“Making Money Made Simple” is the basic book on finance and that is almost totally devoted to this topic. Both books are recommended for somebody starting off the right financial path.