Where can one find the best explanation of the blockchain?
Since nobody answered and I continued my research I'll post something I found online that helped me understand the blockchain. 

http://blockchaindemo.io - This website visually simulates a simple blockchain to explain how it works. Pretty well made in my opinion based on comparison with other explanations I found online.

Otherwise here is the white paper from Bitcoin's creator, Satoshi Nakamoto, even if outdated, it can help understand some of the original concepts:
https://bitcoin.org/bitcoin.pdf