I have finished level 1 and 2 courses, but I haven't found any motivation for level 3 because my Ros PC is defective. CPU doesn't produce anything anymore. I love your content and am happy to be one of your students since Ros1. You had nice examples with hardware with Ros Noetic. Button and LED, it was simple but I currently miss that in ros2 courses.
sorry but when i try to run the robot_state_publisher node and show the rqt_graph i only see the robot state publisher, without showing the tf. what do you think is the problem?