Wifi: Connect to available Wifi networks nearby, ie the wifi created from hotspot your phone. Once Wifi is connected, the car will use data from wifi instead of built-in data from the SIM card
Data: Turn on/off data connection from built-in SIM card
Hotspot: Turn your car into a Wifi hotspot with the data from the built-in SIM card
Bluetooth: Connect to Bluetooth devices, ie, your Phone. You can also connect a BT keyboard to the car also...
For example, when I'm charging and I want to watch YouTube, I turn on hotspot on my phone and connect the infotainment screen to the wifi network created by my iphone, and the car will use my phone as the source of data