These are the two themes that are expressed in the poem. Frost tells us that the path of tradition is the most trusted one, because we learn that this is the path most people take. The path is more travelled, and easy to see. We also learn that choices play a key role in shaping your life because Frost tells us that the fact that he chose the road that was less travelled by "has made all the difference."
himself a coward for going to war and not standing up for his beliefs by going to Canada. He writes that he was too ashamed of what people might say about him if he went to Canada.