Hello everyone, I plan on improving my CV by adding some cryptocurrency courses . Since one can gain a certificate online, I want to use my free time to study a course; nothing specific on cryptocurrency and block chain technology.

I researched on some like coursera which I saw doesn't give certificates in respect to Block chains (I don't really how true that is) and also mygreatlearning but I don't know how good their course is. I would prefer recommendation on an online course that the certificate can be respected for its quality and also free( but not a major concern).

Thanks for your time.