There are many ways of connect 2 verbs in Korean. In case of "verb to-infinitive verb", It depends on the first verb, it be connected with ~하려고 , ~하기로 or ~하기를 try to do ~하려고 (노력)하다 I tried to climb a mountain. 나는 산에 오르려고 (노력)했다. decide to do ~하기로 결심하다 I decided to learn Korean. 나는 한국어를 배우기로 결심했다. want to do ~하기를 원하다, ~하고 싶다 I want to dance. 나는 춤추기를 원한다. 나는 춤추고 싶다 There is no preposition. There are some postpositions in Korean. https://en.wikipedia.org/wiki/Korean_postpositions In case of mean to-infinitive, it would be ~기, ~는 것 ex) to dance 춤추기, 춤추는 것 to sing 노래하기, 노래하는 것

As Heesob said, there are many ways to connect two verbs in Korean depending on what you mean. There's not just one word like "to" (or "a" in Spanish) or the use of the infinitive/dictionary form like in Spanish.