I signed up long time ago just for fun to see what was available. Best bet would be to go physically to the library and have them walk you through the resources.
https://www.slcolibrary.org/learn/all-resources
Just scanning through, it looks like Fiero Code is a coding one, but likely more. If you're not SL County, still probably have resources at your library. It's at least enough to get an idea if he truly likes it.