A manor is a mansion or stately home. A manner is a characteristic way of doing something. These words are homophones (words that sound the same but have different meanings), so it’s easy to mix them up.
In the context of a feudal system, manor referred to an estate or territorial unit consisting of a lord’s home and lands. In other words, the area where he had the right to exercise certain privileges and exact certain fees. Today the word applies more broadly to mean a mansion or large house on an estate.
The word manner means a way of doing things or a mode of action. For example, “in a manner of speaking” means in a way or so to speak. The term “bedside manner” refers to the way doctors or nurses interact with their patients.