Why: among priests, know him as the chief priest Brihaspati, among generals, Skanda, among bodies of water, the ocean, continuing the list into professional and natural categories.

In life: even within professions and natural categories you interact with regularly, there's usually a standout example worth specifically noticing rather than treating the whole category as uniform.

Teaching: within your own profession or field, identify who or what represents the standout example, studying that standout directly often teaches you more than studying the average case.