As a teacher, you’re always thinking about what is best for your students. But it can benefit your students to think of yourself and become a better educator through free online courses.

You try to budget wisely, while making learning a fun and progressive experience, but sometimes you splurge (at times, with your own money) and treat students to supplies that would enhance their education. You could attend fancy workshops and conferences, but those involve travel expenses and time away. Help your kids by helping yourself increase your own knowledge – without sacrificing any of your valuable cash. Visit these five sites that offer a free education in STEM and its related subjects through some of the world’s most prestigious schools.