Answer :

importance of getting to KNOW people before forming an opinion about them are because You have to get to know the person first before you judge them! ... understand it is your own opinions, and many people have their own opinions too ... You should justget to know a person before you starting saying things about them
One importance is that maybe what you think they are is not really is maybe the opposite and that's why they say don't judge a book by it cover because there is a lot of fascinating things both good and bad that you can find out about a person so in overall it's not good to judge people