Comment by dabent

The "Bitcoin and Cryptocurrency Technologies" on Coursera helped me gain an understanding cryptocurrencies. Until I took that course I knew very little about the subject.

It's possibly a little dated now, but it's a good primer.

https://www.coursera.org/learn/cryptocurrency/

I'd love to hear what other cryptocurrency courses others recommend.

As many others mentioned, Andrew Ng's course on Machine Learning on Coursera was also very good.

https://www.coursera.org/learn/machine-learning