For example, to purchase this book with Bitcoin, you would scan the QR code (private key) (on the following page) at the Bitcoin ATM. Exit would then receive Bitcoin from you to the value of USD$85.
To find a Bitcoin ATM (there are 5000 machines in 75 countries listed) see: https://coinatmradar.com/
Bitcoin Wallet
However, if you want to use Bitcoin for everyday transactions you are going to need a Bitcoin ‘wallet’. A wallet can be installed on your computer or mobile phone or it can be a piece of hardware like a usb-stick. A wallet manages your Bitcoin private keys. To purchase or spend Bitcoins you also need a private key.
Once you have installed Bitcoin Wallet on your phone or computer, you will be issued with a Bitcoin address. You will need this to make or pay for things from your Bitcoin Wallet. You will also create a ‘private key’ in order to use your Wallet. The private key is a secret piece of data (a signature) that proves the transaction came from you and prevents the transaction being altered by anyone else.
If you have a Bitcoin wallet and want to cut the connection between your wallet and the wallet where you are sending Bitcoin, then a Bitcoin Tumbler or mixing service can help.