Why do you need to know and understand public opinion?

In order not to do any nonsense due to uncertainty and irresponsibility.
Society is an area without which you still cannot.
But you need to understand everything and not be stupid and simple.
It won’t do anything if you don’t know public opinion.
Opinions, moreover, are different, there are positive and negative, positive, of course, you need to listen to what they advise you or say about you and your studies.
And you don’t have to listen to the negative ones, because there is still no sense, they only spoil the mood and do not give anything positive.