I bought a Kano kit for my son (he was 9 or 10). I think they went under but it was a Pi 3 with a specific Linux based OS designed for learning.
It came in bits with very nice instructions for building it. Bright cables, easy Lego style diagrams. The keyboard is wireless with a built in track pad, and charges via a built in usb cable. All very neat and self contained.
We got to build a whole computer, plug it into the TV, and it behaves a bit like a console.
It has a mix of learn shell, basic programming and fun Linux games (including Minecraft). The whole OS includes a gamified points system too, to encourage more learning.
I think the OS is a free download, but you could easily get a Pi and some fun accessories and build something.
On my to-do list next is building a pi based motion sensor camera for the basement to see if we have mice. Part serious need, part fun game.
For a lot of things though he learns more left alone. Building iPad and iPhone games using some of the drag and drop gaming toolkit apps, for example. My parents had no idea what I did on the computer and couldn’t have helped. I taught myself. He likes that too