Found some awesome write-ups from Alex Dib regarding building your own RFID cloner and a useful Proxmark3 cheat sheet, and wanted to share!
Proxmark3 Cheat Sheet
Great cheat sheet for those using the Proxmark3 software.
https://scund00r.com/all/rfid/2018/06/05/proxmark-cheatsheet.html
RFID Thief v2.0
Very detailed write-up for building your own long-range RFID cloner.
https://scund00r.com/all/rfid/tutorial/2018/07/12/rfid-theif-v2.html
