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I’d say for transportation try to use Naver map and Kakaomap/kakaotaxi if you want to move around by taxi from time to time (good thing about the latter one is that the taxi fare is fixed unlike normal taxis that can rake up the prices anytime)
For food coupang eats is very easy to set up and one of the fastest method, if you dont have an ARC though to set it up, Trazy does have some food delivery service
Other than that papago to get you by if you dont know much Korean. Then, kakaotalk, naver and daum are the most used apps here, which in the case you go shopping and there is an event they will make you sign up with these apps I just mentioned. ^^
