My first “real” robot was a classic Turtlebot/Create-Kinect and Simple Arm. Active robots today (i.e. ones that work) include a Robotis Turtlebot3 Burger, Jetson Nano Jetbot, Jetson Nano Jet Racer (not ROS), Pololu Zumobot, and the latest addition to the menagerie, Jetson Nano/Foxy