Your article is well explain ma'am. You said that courtesy means being polites respectful and kind in the way we talked and act with others. It is abouts using good manners and showing cares for other peoples feelings. You also gave examples of words that indicate courtesy, words like "please, thank you, sorry and excuse me.
I agree with you that courtesy should be a part of our daily life as that will bring lots of good feelings. I wish you good luck in this contest ma'am.