If you＇re a beginner to learn English,first，you will start with "thank you","please",and"sorry".It＇s vital to us as a useful word which we must speak everyday.Also,even if we are children,we should say it by first step.All the words,it means"Courtesy ",

whoever you are,American,Chinese,or another country people.See to develop a good manner,it can help youself all your life.Thanks to the people who help you;say "please" to him whom you want to do with;say"sorry" to him you apologize for.That＇s the way you can follow it.