You need to have some sort of reward loop for kids to maximize engagement, unless he has an extremely strong desire to learn everything CS, books and courses with pretty useless projects are not going to make him learn. On the other hand, tinkering with a piece of hardware and coding custom logic for it produces immediate results that can get someone returning to the activity.
https://www.theverge.com/2021/1/13/22229985/customizable-epa...
You need to have some sort of reward loop for kids to maximize engagement, unless he has an extremely strong desire to learn everything CS, books and courses with pretty useless projects are not going to make him learn. On the other hand, tinkering with a piece of hardware and coding custom logic for it produces immediate results that can get someone returning to the activity.