What is the difference between 에 and 에서 ?Feel free to just provide example sentences.

When it comes to movement, they are opposites:
'에' means 'to', and '에서' means 'from'.

저는 제 남편이랑 여행하러 캐나다에 갔어요 I went to Canada to travel with my husband
그는 프랑스에서 오셨어요 He came from France

저는 공부하러 한국에 갈 거예요 I'm going to Korea to study
저는 한국에서 멀리 살고 있어요 I live far from Korea

에 is used to say that someone or something is somewhere, while 에서 is used to say that something is the location of an action.
에:
저는 병원에 가요 I go to the hospital
저는 집에 티비가 있어요 I have a tv at my house
방에 있어요 I am in the room
극장에 갔어요 I went to the theater

에서:
제 방에서 공부하고 있어요 I am studying in my room
극장에서 영화를 봤어요 I saw a movie at the theater
그 남자는 농장에서 자랐다 The man was raised on a farm