I Want Give A Presentation On Courtesy So Plz Could You Explain Berifly?

You would need to have some idea about what courtesy is in order to present on this topic. Then you can also explain how courtesy had been important throughout history. Courtesy is actually the excellence of manners and polite behavior. It is also referred to a favor or gesture of help. While emphasizing on the importance and history of this word, you can refer to its use in the English history. See the link below for details:
en.wikipedia.org