I need to know the probability of the chances of rolling a 2
When you roll a six sided die, there are 6 possibilities. A standard die means that its a fair die, or that the game is fair: all of the sides are equally likely. So, rolling a 2 has to have the same probability as rolling a 1, 3, 4, 5, or 6, so we divide the probability that something happens, which is 1, by the number of possible outcomes, which is 6. So, the probability of rolling a 2 is 1/6.
The same reasoning applies to finding the probability of flipping a quarter and getting a heads or tails if the quarter is fair.