TERMINAL POINTS

Period
 The period is perhaps the easiest punctuation mark to master. It ends a sentence. Difficulty generally arises only when the period is used with other punctuation marks.

Question mark

The question mark is used at the end of a direct question. Indirect questions take a period.

Exclamation Point
 The most flagrant way a writer demonstrates contempt for his readers is by ignoring punctuation altogether. A close second is the abundant use of the exclamation point. Some writers even use three or more exclamation points, lest the reader not fully grasp the significance of what is being said. To be effective, the exclamation point should be used in moderation.


Taken from: https://www.thepunctuationguide.com/