Proper nouns are nouns that name specific persons, places, things, or ideas. Proper nouns always begin with capital letters.

Examples: Aunt Nakia, Langley Library, Oak Street

The months of the year and days of the week always begin with capital letters.

Examples: December, Monday, Wednesday, and June

All the words in the salutation, or greeting, of a letter always begin with capital letters.

Examples: Dear Friend, Dear Mom, or Dear Grandma Judy

Only the first word in the closing of a letter should be capitalized. All the other words should be lowercase.

Examples: Your friend, Sincerely, or All the best