The most common Korean word for “how” is 어떻다 (eotteota). There are 2 more words with a similar meaning — compare them below. 「how」는 한국어로 어떻다.
such
TOPIK 1 · adjective
how; how much
TOPIK 1 · adverb
to be how; what like
TOPIK 2 · adjective
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato