What could be the best way to introduce the world of computers to a kid, let’s say of 6 years old, so that he learns to handle it like a toy and stops dreading it like some esoteric, arcane and recondite machine from some eldritch, enigmatic, cryptic and phantasmal world ?


https://www.gcompris.net/index-en.html installed on an rPi. My 6yo loves it.
Pi or SBC are a great entry. A pi 500+ would be a great one. Classic wedge style. Just plug it into the TV and wall.