потом

In a sentence

• Сначала мы провели собрание, потом пошли в кафе.

  First, we had a meeting, then we went to a café.

  In this sentence, 'потом' is used as a conjunction meaning 'then' to indicate the sequence of actions.

• Он сказал, что придет потом, после окончания работы.

  He said he would come later, after finishing work.

  Here, 'потом' is used as an adverb meaning 'later' to refer to a future point in time.

• Если ты сейчас занят, можно поговорить об этом потом.

  If you're busy right now, we can talk about it later.

  In this case, 'потом' is again used as an adverb to mean 'later' referring to a subsequent occasion.