In section 3.3 of the TF101 course you have
If you execute the echo command, you should get something similar to this. Be careful with the data overflow because it’s a lot of data published very fast:
Seems like this would be a good opportunity to reinforce something that I think was taught in the basics course, to use the -n option to avoid too much data. So, as an example, the command could be:
rostopic echo -n2 /pi_robot/joint_states
That way you avoid being overwhelmed with data. Just a suggestion.
PS - if there is a different place/way you’d like this kind of feedback, please let me know.