Welcome to the forum!
The beginners section is a good thing to start, like other members mentioned.
Then if you want to learn more about the technical details of Bitcoin and blockchains, read Mastering Bitcoin by Andreas Antonopoulos.
If you prefer visual learning, then search on Youtube for Bitcoin characteristics, I'm sure there will be enough videos to give you a good understanding.
Here is a link to a demo of the blockchain:
https://anders.com/blockchain/ , it's really useful for understanding the blockchain.