I've heard before that anyone can become an expert at something as long as the field is suitably narrow enough for them. Pick a topic, deep dive, and get used t

I've heard before that anyone can become an expert at something as long as the field is suitably narrow enough for them. Pick a topic, deep dive, and get used to that process. One needn't start by becoming an expert on World War 2, one can start by becoming an expert of a specific part of a specific battle and expand.