Please note: The sketch is just the tutorial code and does not contain any code for displaying any data on a TFT display ! The DESFire library contains just the code (commands) needed for the tutorial ...
For starters, you need a pre-wired NFC RFID module as the key hardware. NFC and RFID projects have become a huge trend, but many modules are pricey for electronics hobbyists and need a complex setup.