A symbol is a literary device that stands for something else. It describes a thing figuratively rather than in literal terms.
An example for this is in Minister's Black Veil. The black veil is the symbol of the sins the person hides.
Good things come back around and most myths have morals or hidden messages in them
Hope this helps Good Luck! :)
You could make flash cards out of the key points you need to know. I use an app called quizlet to make flash cards. Hope it helps!