Great source of knowledge about blockchain is a book called Crypto and Blockchain for beginners by Savii Publishing. You can purchase it from Amazon. Have read it and can recommend to all beginners, a nice easy read.

https://www.amazon.com/Crypto-Blockchain-Beginners-Savii-Digital/dp/9949727901/

Or if you are more of a podcast person, then this episode is perfect for you:

http://cryptoandblockchaintalk.com/what-is-blockchain-22