This is the 4195th most frequent Chinese word.
在乎
"To care about" or "to mind."
在乎 is used here to convey the meaning of 'caring deeply' or 'valuing' someone's feelings or opinions.
我非常在乎家人的感受。
I deeply care about my family's feelings.
在乎 is used here to express indifference or lack of concern towards grades.
他对成绩并不在乎。
He does not care about grades.
在乎 in this sentence means 'to place importance on' or 'to regard with significance.'