What are the 4 punctuation marks?

It seems you're thinking about a limited set of punctuation marks! There are many more than four, but here are four that are commonly used:

* Period (.) - Used at the end of a sentence.

* Comma (,) - Used to separate items in a list, after introductory phrases, and in other situations.

* Question mark (?) - Used at the end of a question.

* Exclamation point (!) - Used at the end of an exclamation.

Let me know if you'd like to learn about other punctuation marks!