How to use this symbol — in English language
Recently I saw this symbol — used in a weird way. I don’t remember sentence word by word but it was something like this:
Our product can improve your skin — from separate sells, to overall texture.
What are the rules for this symbol????

Question

Answer

Do you mean the em dash (--)?

If so it's used to identify a completely separate section of a sentence that adds some additional information. It's "almost" a replacement for brackets()

Ex:
I understand your question - about punctuation - and hope that I can help.

The section between the em dashes is not required for the sentence to make sense. It adds a bit of extra information, but it could be removed and not change the meaning.

Here's an article about the this and the many other ways it can be used:
https://www.dictionary.com/e/em-dash/

Answer

Do you mean a "dash"? If yes, it is used to emphasize additional information, join independent clauses, mark non-essential information, offset lists placed in a sentence.

Answer

Hi Blake, good question. This symbol, (?) Is a called a question mark. You use it when you are asking a question and you write it at the end of that question.

For example, "What is your name?"

لا تفوّت فرصة تعلّم لغة جديدة وأنت مرتاح في منزلك. تصفّح مجموعتنا المختارة من مدرّسي اللغات ذوي الخبرة وسجّل في درسك الأول الآن!