WiFi and Bluetooth security is probably the easiest to learn about, but other networks are just as vulnerable when an RTL-SDR is used. Another option Flipper Zero, a hacking gadget for Sub-1 GHz ...

This combines a Raspberry Pi 3 with a seven-inch touchscreen and a Hak 5 WiFi ... hacking tools to hand. The package also includes a 20,100 mAh battery, so you won’t even need a wall socket ...