To understand how Bitcoin works, let's take a look at its structure. The Bitcoin network consists of nodes that store copies of all transactions made since the creation of the network. Nodes collect these transactions into blocks and add them to the blockchain, which is an immutable ledger of all transactions. If you want to start learning about Bitcoin, you can use services like
https://getblock.io/nodes/btc/ to access nodes on the Bitcoin network. This will allow you to access real-time block and transaction data, which can be useful for studying the network.