It is important to have manners to go out to eat, if you need a job, and to meet people.
My first reason is when you go out to eat, you need manners because you can't talk with your mouth full. Also if your face is dirty you need to clean your face. When you're eating and you burb you need to say excuse me because if not it would be rude.
Another reason is you need a job. You don't want to be rude to your boss. When you do have manners you can do your job right. Also you need manners because you do not want to be rude to coworkers.
My last reason has to do with meeting people. When you meet people or you accidently bump into somone you have to say excuse me, or else they might think you are mean. Also you need manners to say hello or nice to see you because if you don't greet people they might think you are unfriendly. You need manners to not be mean or selfish.
I think that's why manners are important. You need them to go out to eat, you need them at you job, and to meet people. Having manners is a big help to you.