What are some of the beliefs & expectations that have to be ironed out prior to marriage?

Dear Gaone Please keep my identity anonymous. I am 22-year-old female currently getting married and kinda have mixed emotions. I am overjoyed and scared at the same time. Overjoyed that I have found a lifetime companion but scared that things may not turn out as I had expected given the high divorce rates worldwide. In your view, what are some of the marital beliefs and expectations that ought to be ironed out prior to holy matrimony? Marital beliefs and expectations that sometimes lead to the dissolution of a marriage?