In this lesson you'll learn how to install Rust's toolchain.
The install page warns at the bottom that the PATH variable might not be updated successfully right away (or at all), and indeed the output in Terminal concluded with telling me the variable would be updated once I had signed out and in again. Restarting Terminal did the trick and allowed me to run the various commands at the end of this video.
Thanks for bringing this up. That's a very good point and obviously not something I've covered in this lesson (reason being that my PATH was already setup).
I hope other people running into this will see you comment here!