Common Nouns ;)

We write common nouns without a CAPITAL LETTER.

You should write it with a capital letter ONLY when it begins a sentence.

Common noun is a noun referring to a person, place or thing in a general sense. 

Proper Nouns ;)

We write proper nouns with a CAPITAL LETTER.

Proper noun represents the name of a specific person, place or thing. It also represents the names of.......