Should one direct an 11 year old to ask questions about programming on StackOverflow? Is there another site in the StackExchange network that is better suited?
If you think their question is good and worth asking, then you'll have to get it from them and ask it yourself. Don't worry about whether it is "too simple"—there's no "experts only" requirement in place for questions on Stack Overflow. We allow any question, as long as it is well-formulated and answerable, in accordance with the general guidelines in our FAQ.
The advantage of asking the question yourself is that you'll be able to ensure that it's appropriately constructed and a good fit for Stack Overflow. Questions like "What programming language should I learn first?" are not allowed, and will quickly be closed as "not constructive". But since it is a question targeted to a very different audience than our typical user, you might want to mention that explicitly somewhere in the question. (Or just in case it gets wildly upvoted and makes its way in to your "top questions"—although there's little reason to be embarrassed by asking a "simple" question!)
No, because StackOverflow isn't for questions about programming - it's about programming questions.
So, "how should I store an IEEE 754 floating point value in SQL Server when
Also, and here I'm straying into opinion, a collection of Q & A makes for a terrible learning resource - far better a book or other resource intended to serve a didactic purpose.