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As you mentioned, the basic concept is knowledge. People ask new questions only if they believe that they can get really useful information. This requires having an expert group as a prerequisite in the community. Novice people can increase the traffic and question database.
But the first focus of the community should not be on novices, it should be on experts. Because if there is a sufficient number of experts in the community, then novices will follow them. But the reverse is not true, namely experts won't follow a community web site full of novices.