A Capital Letter is used: 1) to begin a sentence, or a quotation or direct question within a sentence; 2) to begin every word, except conjunctions, articles, and short prepositions that are not the first word, in the name of a book, magazine, work of music or art, business, agency, religion, holiday, etc.; 3) to begin every main word in a proper noun; 4) to begin every main word in the name of a day, month, era, etc.; 5) to begin many abbreviations; 6) to begin a noun or a pronoun referring to the Deity; 7) to begin the salutation and the complimentary close of a letter.