Bitcoin isn't attached to a state or government, so itu doesn't have a central issuing authority or regulatory body, bassically, that means there's no organizational deciding when to make more bitcoins, digiring out how many to produce, kering track of where they are, so how does bitcoin work as a currency ?
Just like the dollar bitcoin is a currency but instead of having a physical form it is crypto, meaning that it is encrypted with sequence stored in a public peer to peer network that is the blockchain, every bitcoin transaction is recorded on this network, which prevents people from spending the same bitcoin more than once, so every time you send a bitcoin transaction miners take time to verify that it is not duplicate, and since bitcoin has a limited supply it is essentially like gold where its value keeps on going up every time this supply goes down.