The most common Korean word for “attend” is 다니다 (danida). There is one more word with a similar meaning — compare them below. 「attend」는 한국어로 다니다.
to attend; to go regularly
TOPIK 1 · verb
attend
TOPIK 1 · verb
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato