This is the 1890th most frequent Korean word.
규정을
"규정을" is the accusative form of "규정," meaning "rule" or "regulation."
규정을 is the object of the verb 따르다 (to follow), indicating that 'the regulations or rules' are what should be followed.
규정을 따르는 것은 중요합니다.
Following the rules is important.
규정을 is the object of the verb 이해하다 (to understand), specifying that 'the rules of the company' are to be comprehended.
회사 규정을 잘 이해해야 합니다.
You need to understand the company regulations well.
규정을 is used as the object of the verb 추가하다 (to add), meaning 'the new rules' are intended to be appended.