Particles in Korean are put after a noun to define its grammatical function inside a sentence.
In this case, the particles 에 and 에서 are used to define , respectively, the time and place of an action. In other words, where and when that action will either occur or is occurring or already has.
Time + 에 / 장소 + 에서 + Verb
(Time) + 에
(Place) + 에서
Verb
금요일에
운동장에서
농구를 해요
토요일에
도서관에서
책을 읽어요
일요일에
영화관에서
영화를 봐요
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