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It’s great that you want to support your kid and hopefully get them away from the focus-destroying dopamine traps that are many „kid friendly“ apps. But please ask yourself what your kid likes first, not what you want them to be interested in. It’s perfectly fine to restrict tablet time and let him focus on what he likes, be it computer stuff or football or cycling or reading or painting or whatever. If he really interested in Linux and nor, xor etc that’s great, but don’t force it on him.
And that is coming from someone who bought and built his first own computer around that age and wrote his first few lines of very basic basic code not long after. Not because it was expected of me, but because I was interested and given the opportunity to follow those interests.
So, if that kid is interested in computers, Minecraft is a great game for kids. It encourages creativity, problem solving, perseverance and, maybe later, collaboration. It’s also possible to play together and scale their experience to their age: get started in creative or peaceful, then let them discover mobs and mods when they are a bit older, then let them play with friends.
If the kid likes building and Legos, you might want to look into Lego Boost and Spike, although they are rather expensive.
Oh, and paint. Kids love paint, be it MS paint, Paint.net or any other open source alternative. Show them that with a computer they can create, not just consume.
What is the „new experience“? Usually that means enshittification.