People:
* Names: John, Mary, Emily, Michael, etc.
* Nicknames: Jimmy, Lil, Big Mike, etc.
* Titles: King Charles III, President Biden, Dr. Smith, etc.
Places:
* Countries: United States, Canada, Japan, etc.
* Cities: New York, London, Tokyo, etc.
* States: California, Texas, Florida, etc.
* Continents: North America, Asia, Europe, etc.
* Rivers: Nile, Amazon, Mississippi, etc.
* Mountains: Mount Everest, Mount Kilimanjaro, etc.
* Buildings: Empire State Building, Eiffel Tower, etc.
* Roads: Route 66, Interstate 5, etc.
Organizations:
* Companies: Apple, Google, Microsoft, etc.
* Schools: Harvard University, Oxford University, etc.
* Government agencies: FBI, CIA, NASA, etc.
* Non-profit organizations: Red Cross, Greenpeace, etc.
Other:
* Books: "To Kill a Mockingbird," "The Lord of the Rings," etc.
* Movies: "Star Wars," "The Avengers," etc.
* Events: Olympics, Super Bowl, etc.
* Holidays: Christmas, Thanksgiving, etc.
* Languages: English, Spanish, Mandarin, etc.
* Religions: Christianity, Islam, Buddhism, etc.
* Brands: Nike, Coca-Cola, McDonald's, etc.
* Historical periods: Renaissance, Victorian era, etc.
Remember:
* Proper nouns are capitalized.
* There are many more types of proper nouns than those listed above.
* The list of proper nouns is always expanding and changing.
If you have a specific proper noun in mind, feel free to ask me if it is correct. I'm happy to help!