Regarding RFID, I plan to study them on an almost contacted level. Something like a credit card. What sparked my interest were two things: my garage door and my new credit card. The credit card was advertised as "contactless" but I'm a bit weary about its security.
My goal with the RFID was to see if I can read raw bytes/signal from my old hotel card and credit card. I wish to do the same thing for my garage door. Both will involve the use of Arduino and an appropriate sensor. Alternatively, for the other frequencies I mentioned, may I ask what is an ideal aftermarket RF hobbyist scanner? I know in the realm of FPV drones, such devices exist, but I have never had my hands on one...