Use capital letters when writing out a proper noun. Proper nouns are nouns that describe an organization, person or place which has a specific name or title like Golden Gate Bridge, Atlantic Ocean or Martin.
Begin a noun with a capital letter if it is naming a specific work, person or company. Examples include books like "To Kill a Mockingbird," films like "Citizen Kane" and song titles like "Hey Jude." Begin a noun with a capital letter if it is naming something. Examples include: the name of a person (Brett) and a company's name (IBM or Apple.)
Use a capital letter for proper geographical nouns. Examples include a city (Los Angeles), a country (United States) and a state (California.)
Start a noun with a capital letter for calendar items like the days of the week (Monday), the months of the year (February) and holidays (Christmas).
Use a capital letter on nouns that are part of a group (Republicans, Japanese, Los Angeles Dodgers), are figures in religion (God, Buddha, Bible) or describe a specific language or nationality (Greek, English).
Capitalize a noun when it is the beginning of a sentence. For example: We walked to the store. "We" isn't usually capitalized but since it is at the beginning of a sentence, it is in this case.
Make sure the pronoun "I" is always capitalized. For example: So, I walked the street.
Capitalize a noun when it is describing a title and the person. For example: President George Washington. Do not capitalize a title when it comes after the person's name. For example: George Washington was president.
Quote something and capitalize the first word if it is a noun. For example: He said, "Bricks were made to build the house."