Explain the difference between a proper noun an... - SS1 English Grammar : pronoun II Question

A proper noun is the name of a specific person, place, or thing, and is always capitalized. A common noun, on the other hand, is a general name for a person, place, or thing, and is not capitalized unless it appears at the beginning of a sentence or in a title. For example, "John Smith" is a proper noun, while "man" is a common noun. Other examples of proper nouns include "Paris," "Mount Everest," and "Microsoft," while examples of common nouns include "dog," "city," and "book."