"そうか"　"そうですか"　"なるほど"　"わかります"?
What is the difference in the usage of these expression? If you could give examples sentences or situations, that would be awesome. Thanks! :)

Question

Answer

そうですか is the polite form for "Oh, really?" (usually rhetorically when listening to someone)
そうか or そっか are informal forms of そうですか
なるほど is more like "I see"; like someone explained something to you

집에서 편안하게 언어를 배울 수 있는 기회를 놓치지 마세요. 경험 많은 강사진을 살펴보고 지금 바로 첫 수업을 신청하세요!