How to teach a child to discover truths

Recently I was talking with a friend who has a 3 year old daughter about how to best rear a child. My own son is 5.5 years old.

Whenever my son has a question with a non-trivial answer, e.g. what resources are needed to build an umbrella in the game Don't Starve, my reaction is "let's ask the internet" and I show him that most questions have an answer when you know how to look for it. I don't want to be the father who knows everything but rather who knows how to find things out.

Of course, there are much more to discovering the truth, like asking correct questions and honing his bullshit detectors, than these simple exercises. He needs to grow up a little for that.