In order to understand probability, you must know how many possible ways a thing can happen. There are two possible ways. This is 6 because there are six faces of a die. This is a different question from asking what is the probability of throwing 6 heads in a row. We will answer that in a minute.
Single events Flipping coins and throwing a single die are examples of single events.
AND then another thing happens. You multiply the probability of one thing happening by the probability of the other thing happening. It depends on if you put the 1st one back before drawing the 2nd. You have a better chance of getting 2 aces if you put the first one back before drawing again. Well, if a sure thing has a probability of 1, then the probability that something does not happen is 1 minus the probability that it does happen.