Most greetings are not a question and do not call for a question mark. But sometimes you want to say hello, who is there? In that case you do use a question mark. If you are saying hello to someone and you do know who that person is, then it is not a question. Hello Mark, good to see you. You may also ask, how are you? That is kind of a greeting but it is really more of a pleasantry or general conversation, rather than a greeting. If you ask "how are you?" but you don't really want to know the answer to the question, it's just a nice thing to say, then it qualifies as a greeting with a question mark.
you have to put a colon(:) at the end of the company or name
No. it's not necessary to put a period after a question mark.
No, a question mark alone is sufficient.
You use a question mark because it's a question. You are asking them how they are doing.
you put an upside down question mark in the beginning and then a regular question mark at the end. Example: ¿Donde esta? The way to do a updside down question mark when typing is: SHIFT+CTRL+ALT+?
In American English, the question mark typically goes inside the closing quotation mark if the question is part of the quoted material. For example: "Did you hear that?" she asked.
out
No, punctuation rules dictate that a comma is not used after a question mark. Each punctuation mark serves a specific purpose and should be used independently in a sentence.
No, there is no need to put a comma behind the word "that" in this context. The use of a comma depends on the structure and flow of the sentence.
at the end
A question mark (?)
In a quotation question, the question mark should be inside the quotation. "Where did Mark go?" asked Zack. Anna replied, "I don't know. Where did he go?"