He pointed at the location on the map.

A common noun refers to a noun that does not point to a specific person or thing.

A noun is one of the main elements of a sentence.

Since it started raining, I opened my umbrella.

He is learning how to use gerunds.

A proper noun is a noun that refers to a specific person, place, or thing.

What is his real name?

Abstract nouns, unlike nouns that refer to concrete things, refer to concepts or states that do not have a specific shape or color.

He is learning how to use collective nouns.

'Apple' is a count noun, and you can count it as one, two, etc.