Be warned!
⚠ It should be pointed out quite early that the Proxmark3 is not for beginners.
If you are not already fairly familiar with electronics, embedded programming, some RF design and ISO standards, this device will probably bring you more frustration than anything else!
Users that do not understand the basic principles behind RFID may have difficulty using the device.
Rules of Proxmark3
First rule of proxmarking read the datasheets
Second rule of proxmarking search the forum
Third rule of proxmarking learning is hard and takes time
Now go and read the Readme
Other valuable source of information is the Official Proxmark3 wiki but beware a lot of things have changed between the official Proxmark3 and this repo