The residents of East Egg are considered "old money," which means that wealth has been in their families for generations.
The biggest crisis has been in is having a faulty zipper on the day of my aunt's wedding and I was like her main flower girl which meant I would have to stand up next to her, in front of the whole church with a faulty zipper that kept falling down. I actually wasn't calm because I was freaking out and going to my mom and asking her to fix it every minute. I would have probably stopped pulling the zipper harshly next time so that I don't have to be embarrassed
A metaphor for courage might be describing someone as having "the heart of a lion". He does not actually have the heart of a lion, it's a metaphor to show that he is courageous.