You've learnt how to control a motor and connect Inputs so why not continue your journey by transferring your microcontroller to this stand alone rover.  Set out in the same simple to understand way as the Learn Arduino System you can simply connect the relevant points and off you go!
 
The rover includes motors, wheels, bump switches and IR sensors (for line following tyoe activities).
Please note that the ESP32 microcontroller is not included in the kit.