Ask HN: Do you know a good course or book to learn CS basics for teens?

A teen relative of mine is interested in computer science and wants to explore this path before going to college.

I need to recommend an overall learning experience for him that is appropriate for his age (around 16) and want him to understand the basics without getting too deep in math or algorithms, so he can get a good view of the field and understand the basics.

Have you came across a simple course, book or learning platform (preferably free) appropriate for beginners?

Thanks!