If you have any technical skill and are interested in learning how Bitcoin and other cryptocurrencies work, Princeton University's free MOOC that focus on the technical side of this space is a great place to start.
You can choose to pay for a certificate or audit the course for free. Class starts this week.
https://www.coursera.org/learn/cryptocurrency
Each week has up to an hour and a half worth of video among other content, links. and resources. While this course won't have you becoming a professional blockchain developer in the next 11 weeks, it will get you a much better grasp on the technical side of crypto than most people in this space have.