How to write the correct letter format?

1, salutation, salutation is the beginning of the letter, and it should be capitalized. Address is a way to show respect for others. We should avoid and prohibit the use of direct addresses such as "you" and "I" in letters. Add a colon after the address to indicate that there is something to say below.

2, greetings, greetings should be written in the title of the next line, empty two boxes. It can exist independently as a part. Greeting is a civilized and polite behavior, but also a courtesy to the recipient, which reflects the writer's concern for the recipient. The most common greeting is "Hello", and "Near Good" often changes with the seasonal solar terms, such as "Happy New Year" and "Happy Spring Festival".