内行

他好像对音乐剧什么的很感兴趣，而且还非常内行。

他好像對音樂劇什麼的很感興趣，而且還非常內行。

He seems very interested in musical theatre and the like, and he also seems quite adept.

外行谈策略，内行谈后勤。

外行談策略，內行談後勤。

Amateurs talk strategy, professionals talk logistics.