The challenge here is not to be an expert in technical concepts but rather to be comfortable exploring and learning about technical as well as nontechnical concepts. I have seen nontechnical product managers excel in highly technical organizations when they approach technical challenges with openness and curiosity, and I have seen nontechnical product managers falter in relatively nontechnical organizations because they see technical work as either uninteresting or unapproachable. The best product managers are just as curious about technical concepts as they are about nontechnical concepts.
