Coursera is one of the popular online course and is currently conducting free course for Crypto Currency geeks and the course has been already more than 1 million enrolls.
How about you? Would you like to enroll also with the same course?
If it is free,why not . Bitcoin holders most especially traders must be knowlegable about technical aspecs of crpto currency world. It might big help for us in decision making when we have some technical knowledge how the digital currency works and the reasons behind of changes.