I took "Become a Product Manager" (https://www.udemy.com/course/become-a-product-manager-learn-...) and was quite happy with it. The title is a bit tacky - it is not instantly going to turn you into a product manager. But it is a nice overview of the field.

I paid about 10 bucks during one of the countless sales. Never pay the full price at Udemy. Their pricing policy is ridiculous. I feel like you only have to wait a few days for the next 90%-off-discount to come along. I counted three times during the past few weeks.