I will post a lot of videos that I think can help to understand Bitcoin. They are part of a Coursera program focused on Bitcoin.
I have been reading Crytocurrencies, and these videos are a nice follow up to the info you can find in that book.
I specially like the Video number 1 and 4 and I will put the links below. I really recommend to go one by one, but so far those are the best for me.
Intro to Crypto and Cryptocurrencies
How to Store and Use Bitcoins