Here is an educational robot that helps you get serious about AI development. The SparkFun JetBot AI Kit v2 is powered by Jetson Nano Developer v3. It comes with plenty of samples and everything you need to program your robot to follow lines and avoid obstacles.
This kit can be extended with sensors and is compatible with Python. The included image comes with JetBot ROS, AWS RoboMaker with AWS IoT Greengrass, so you can build connected robots.