So the only suggestion I have, is to make it easier to get back to the original text. On the last Nested List exercise, I accidentally removed some of the text, and had a heck of a time getting that text back. I eventually had to refresh the page and go through the first 2 or 3 nested list excersizes again to get to the final exercise.
Having a “Start Over” button for each exercise that puts the input back to its original state would have been nice.