Manners is acting polite. Courtesy is politeness, respect, and consideration for others. Having good manners is part of being courteous.
What is the difference between good manners and good breeding?
So that the difference between good breeding and good manners lies in this, that the former cannot be attained to by the best understandings, without study and labour; whereas a tolerable degree of reason will instruct us in every part of good manners, without other assistance.
Manners is a synonym for breeding in refinement topic. In some cases you can use “Manners” instead a noun “Breeding”, when it comes to topics like elegance, …