사용을

사용을

"Use" or "usage."

Here, '사용을' is used as the object of the verb '배우는', showing the act of learning how to use something.

컴퓨터 사용을 배우는 것은 유용합니다.

Learning to use a computer is useful.

Here, '사용을' specifies the action that needs to be completed before the next step, thus being an object of the verb '마친'.

프로그램 사용을 마친 후엔 종료 버튼을 누르세요.

After finishing using the program, please press the exit button.

In this sentence, '사용을' functions as the object of the verb '제한해야', indicating the scope of what needs restriction.

인터넷 사용을 제한해야 합니다.

Internet usage must be restricted.