NFC

We had different developer tools and samples mostly from NXP and experimented a bit with reading and writing MIFARE Tags.

I did some reading this lesson, but NFC technology is already very complicated and proprietary.
Only for old and cheap cards it is possible to clone them, since the new ones often make mutal authentication and use PKI for rights management.

RFID is a simple type of NFC and is in use almost anywhere. EAS (Electronic Article Surveillance) is also based on RFID tags and trying to trick this system could be a future project.
https://en.wikipedia.org/wiki/Electronic_article_surveillance

Simple RFID Tags cost only a few cents.