Quando usar Letras Maiúsculas em Inglês? Capital Letters

You should always use a capital letter in the following situations:

 

In the names of people, places, or related words

 

Africa, African

Buddha, Buddhism

Shakespeare, Shakespearean

 

At the beginning of a sentence

 

The museum has huge potential. It will be a great boost to the area and we are really excited about it.

 

In the titles of books, films, organizations, etc.

 

Use a capital letter in the titles of books and other publications, films, organizations, special days, etc. In such cases, you need a capital letter for all the main words but not for the connecting words such as a, an, the, or, and, etc.:

 

Pride and Prejudice

Christmas Day

the Houses of Parliament.

 

In abbreviations

 

If you’re using the first letter of the abbreviated words, every letter should be a capital, e.g.:

 

BBC (British Broadcasting Corporation)

USA (United States of America)

MP (Member of Parliament)

 

With Days of the Week and  Months

                       January, March

                       Tuesday,Saturday

 

 

 Fonte: http://oxforddictionaries.com/