Check the following resources:
1. What is Blockchain
https://builtin.com/blockchain
https://www.guru99.com/blockchain-tutorial.html
https://www.pwc.com/us/en/industries/financial-services/fintech/bitcoin-blockchain-crypt
ocurrency.html
2. Blockchain in Python
Tutorial 1
Tutorial 2
Tutorial 3
3. REST API
REST API
4. Flask tutorial