Know a good computer quiz for kids?

My kid (a preteen) wants to buy their own computer, but I want to be sure they know enough about them. They’ve used Kindles, not desktops. I want to find a website with some basic info or lesson that covers things like hard drive, processing, and basic safety. Know any good ones?

Check with their teachers to see hardware/system would best complement what the school system uses. Build on what mastery your preteen already has.