100 ways to improve your writing - Gary Provost 2019

Use exclamation points only when exclaiming and question marks only when asking questions
Six ways to avoid punctuation errors

Most of us presume we know when to use question marks and exclamation points. But both punctuation marks have given many good writers trouble.

Exclamation points should be used only after commands or statements of strong feeling. Only teenagers are justified in believing that each and every statement one utters is an exclamation. The rest of us should know better. Trust your sentences to reveal emotions. Don’t rely on punctuation to show how much feeling you bring to your writing.

There are two instances when writers misuse questions marks. First, a question mark should be used only to ask a direct question, not to express wonderment. Second, a question mark is not used to ask an indirect question.