Data is a broad term that could mean any type of information. Structuring such information is related to organizing and storing it for future access or manipulation in an efficient manner.
Note on exercises: I'm not using the actual implementation here because
- These notebooks do not allow me to import classes like a structured project.
- The idea of each exercise notebook is to show the real solution. Thus importing would have the reader opening a new window, and I want to keep them on the site to focus on the problem under analysis.