The bitcoin network isn’t controlled by one central authority. Every machine that mines bitcoin and processes transactions makes up a part of the network, and the machines work together.
Well, kind of. Users can hold multiple bitcoin addresses, and they aren’t linked to names, addresses, or other personally identifying information. No one know that it’s yours bitcoins. No one will know for what you have used them and for what you have paid.
Transaction fees are miniscule
Your bank may charge you a $10 fee for international transfers. Bitcoin doesn’t.
You can send money anywhere and it will arrive minutes later, as soon as the bitcoin network processes the payment.
A bitcoin address is a set of letters and numbers that allows the blockchain to recognize when funds are sent to or from your wallet.
A "wallet" is basically the Bitcoin equivalent of a bank account. It allows you to receive bitcoins, store them, and then send them to others.
For more info, you can find it here: CoinDesk, What is BitCoin