Platform: Coursera, University of Pennsylvania
This course will introduce you to the microeconomic theory. As the course is directed at people who already have some experience, I would recommend the course only if you have studied microeconomics previously. However, if you have this course is really great because if only takes around 9 hours to complete!
Explore this course further at the following link: https://www.coursera.org/learn/microeconomics-part1?