This is the 11145th most frequent Korean word.
기숙사에
"To the dormitory" or "at the dormitory."
Refers to an indirect object in discussion, specifically mentioning 'about the dormitory'.
그는 기숙사에 대해 이야기하고 있어요.
He is talking about the dormitory.
Describes the action of going to a place, specifically the dormitory.
나는 기숙사에 갔어요.
I went to the dormitory.
Indicates the location where the subject resides: the dormitory.