There is no better way to learn robots and coding than building and programming your own. The Adeept RaspTank is a robot tank based on Raspberry Pi and 4DOF robotic arm. It comes with OpenCV tracking and LEDs, and Python coding.
The kit comes with acrylic plates, Adeept Motor HAT, Pi camera, ultrasonic sensor module, LEDs, line tracker, and everything you need to put it together.