We have written a lot in the past about high schools incorporating financial education into their curriculum and local communities offering personal finance courses for kids. But personal finance lessons aren’t just for children and teenagers—they’re valuable even for those of us long-since out of school.

Jeremy Vohwinkle at Generation X Finance has compiled a list of 20 free online finance courses—a majority of which are offered by colleges around the country. Highlights from the list include 23 Money 101 lessons from CNNMoney.com and an online income tax course.

If you have some free time, these courses could prove to be valuable. Even if you think you have your finances in control, it’s worth a look. You may even learn a thing or two.