Udemy is a nice place where you can find video courses on almost any subject.
However, not all the courses are taught by very competent people so you have to be careful before choosing a course. But ...
I found there a very good course on the "The Basics of Blockchain" taught by Tom Serres and Bettina Warburg of Animal Labs.
They teach the implications that blockchain technology has on three main areas that are
1- Business
2- Technology
3- Economics
It's a great course for beginners and as a bonus, you get some exclusive talk from great blockchain experts.
This is my certificate at the completion of the course.
One of my first achivements ;-)