Recommendations for good resources on writing good error messages [closed]

1. Which is not recommended for error messaging in application?
2. For what reason do you think it is important to write down error messages?

Which is not recommended for error messaging in application?

Avoid Uppercase Text

Upper case text is difficult to read it gives an impact of shouting on user. Error message is a place where user is informed about some critical scenario, so using upper case text can give him a feeling of discouragement.

For what reason do you think it is important to write down error messages?

Effective error messages inform users that a problem occurred, explain why it happened, and provide a solution so users can fix the problem. Users should either perform an action or change their behavior as the result of an error message. Well-written, helpful error messages are crucial to a quality user experience.