Eg. Home Automation with custom LED strips + an ESP32 (via. tasmota, esphome etc...), Wireless sensors using the same, FPV Drones and RC toys/cars in general, 3D printers, Custom keyboards are the usual gateway hobbies in my experience. I haven't seen anyone who is into one of these and hasn't explored the others.
Eg. Home Automation with custom LED strips + an ESP32 (via. tasmota, esphome etc...), Wireless sensors using the same, FPV Drones and RC toys/cars in general, 3D printers, Custom keyboards are the usual gateway hobbies in my experience. I haven't seen anyone who is into one of these and hasn't explored the others.