When to use common in Korean
Korean: 공통[ gong-tong ]

When to use it
공통 means something is shared by two or more people or things. In school, you can use it for a subject, rule, or homework that everyone has together. Use it when you want to talk about the same part, feature, or idea.
Example sentences
학교에서는 공통 과목을 배워요.
At school, we study common subjects.
우리 가족은 공통 규칙이 있어요.
My family has a common rule.
저와 친구는 공통 취미가 있어요.
My friend and I have a common hobby.
두 가방의 공통점은 색이에요.
The two bags have the same color in common.
여행 전에 공통 준비물을 확인해요.
Before a trip, we check the common things to prepare.
오늘은 공통 숙제가 있어요.
Today, we have common homework.