This is the 9863rd most frequent Korean word.
곳에선
"곳에선" means "at/from a place" or "in a place" in English.
'곳에선' indicates the specific place 'there' where the action (being many people) occurs.
그곳에선 사람이 많습니다.
There are many people at that place.
'곳에선' refers to quiet places, and emphasizes the action (focusing).
도서관 같은 조용한 곳에선 집중하기 좋아요.
In quiet places like libraries, it's good for focusing.
'곳에선' specifies crowded places, highlighting the need for caution in those environments.