Anyone can use the word "please know" as the end of an email, but generally the subordinates of their own company or department do not use it often when sending emails to their superiors, and generally use "please check", "please instruct" or "please instruct" as the end of the email.
Because the word "know" is too narrow, it will generally make the leader feel that you write to him just to let him know the result of what you have done, and there is no need for other requirements or guidance.
"Please know" is more used in email communication with customers, regardless of whether the other customer's level is higher than yours.
Letter writing mainly has the following requirements:
1. When communicating with the other party for the first time, you should write your address at the end of the stationery in detail and accurately. Postal code or even telephone number, so that the other party can reply or call back.
2. The writing language should be colloquial. Try to use pure, standardized and civilized words to express the meaning clearly. When you write a letter, you should be careful and get to the point.
When writing a letter, you can't use a red pen on the letter paper and envelope, because writing a letter with a red pen is usually considered as a dear John letter, so it is generally written with a black and blue brush and pen, and you can't use a pen that is easy to smear, such as a pencil.
The handwriting on letterhead and envelope should be neat and clear, and the punctuation should be accurate. The font is better in block letters.