On page 3, third code block ends with ``` when it shouldn't.
Several commands (such as those on page 3) don't give any visual feedback when they are run, and students get confused and worried that it didn't work right. Add notes to that page about how these commands (and some others) won't return anything?
On page 4, running the command to install the extension pack will start of a very different looking install confirmation box, and the arrow keys will not help you maneuver to the confirmation button, but will. Add a note of that to that section.