In Korean, it's super common to add "하다" (which means "to do") after a noun. This neat trick turns the noun into a verb. You can do this with almost any noun.
Instead of saying "noun + 를 하다," people often just say "noun-하다." It's shorter and snappier. People started talking this way because it's quicker and saves time.
In formal situations or when writing, you'll see "noun + 를 하다" more often. But in everyday chat, people usually say "noun-하다." It's more casual and flows better in conversation.
Examples
전화를 하다 = 전화하다 (to make a phone call)
운동을 하다 = 운동하다 (to exercise)
공부를 하다 = 공부하다 (to study)
요리를 하다 = 요리하다 (to cook)
청소를 하다 = 청소하다 (to clean)
여행을 하다 = 여행하다 (to travel)
쇼핑을 하다 = 쇼핑하다 (to shop)
노래를 하다 = 노래하다 (to sing)
일을 하다 = 일하다 (to work)