This is the 3053rd most frequent Korean word.
홍보하는
Promoting.
홍보하는 in this sentence is used as a verb form describing the action of promoting the company.
그는 회사를 홍보하는 데 많은 시간과 노력을 들입니다.
He spends a lot of time and effort in promoting the company.
홍보하는 here refers to the act of promoting within the phrase '홍보하는 기술,' showing it as an adjective phrase modifying '기술' (techniques).
홍보하는 기술이 잘 갖춰진 직원들이 기업의 성공을 이끌 수 있습니다.
Employees who are skilled in promotional techniques can lead the success of a company.
홍보하는 is used to describe the process of promotion ('홍보하는 과정'), acting as a modifier.