Any good materials or links to understand how all this blockchain works ? Thx
There are many valuable online courses, I enrolled in Blockchain for Business - An Introduction to Hyperledger Technologies on edX for example or you can check the mit page http://blockchain.mit.edu out.
I'm also spending a couple of hours on this forum everyday and learning a lot, just starting from the pinned posts and then choose only one argument a day to delve into it.