When to use to open in Korean
Korean: 열다[ yeol-da ]

When to use it
열다 means "to open." You use it when something closed becomes open, like a door, window, book, or box. It can also be used when you start something, such as a store or a meeting.
Example sentences
엄마가 문을 열어요.
Mom opens the door.
더워서 창문을 열었어요.
It was hot, so I opened the window.
수업 시간에 책을 열어요.
I open my book in class.
아침 아홉 시에 가게를 열어요.
We open the store at nine in the morning.
호텔에서 카드로 방 문을 열어요.
I open the hotel room door with a card.
회의 전에 노트북을 열어요.
I open my laptop before the meeting.