I found a gem! 
Definitely the best exploration of blockchain I've ever seen. Highly recommend checking it out if you haven’t gotten it yet.😏  Also watch the second part of this video, about public/private keys and signing, it's worth it

https://www.youtube.com/watch?v=_160oMzblY8

Moreover, you can try blockchain demo yourself with the data you want, then try to change something and see why blockchain is so cool!

Link:

Moreover, you can try blockchain demo yourself with the data you want, then try to change something and see why blockchain is so cool!

Link: https://andersbrownworth.com/blockchain/distributed