A dream that you are standing at the edge of a cliff can mean that you are facing a difficult situation that requires you to take a risk.
Your dreaming mind is letting you know that now is the time to decide how you will deal with the situation, and that there are times in life when you will have to proceed without knowing exactly what the outcome of your actions will be.
A dream that you fall off the edge of a cliff can mean that you are afraid of making a wrong decision.
Falling off a cliff in a dream can be a message that you need to pay more attention to things and pay attention to details.