What does "Here we go" mean?
Please restrict yourself to one punctuation mark at a time.
emsr2d2 is right saying that more context would help. As far as I know, this expression is used, in addition to what emsr2d2 has said, when the speaker wants to express his/her reaction to something (positive or negative) that's just happened or is happening at the moment. For example, one can use this expression in a situation like this:
Mother: What do you think of marrying Bob?
Daughter: I don't like his hair.
Mother: Here we go. You know, I wonder if there is ever a guy that you'll ever approve of.
(On a roller coaster) Here we go!!!!! = excitement.
(Talking to someone as in Bennevis' example) Here we go again! = annoyance
(At a restaurant) Here we go. = perhaps the arrival of expected food or something similar ("Aha. Here we go. Food's arrived.")
Now you can see why context is important
I got the point.Thank you for the information you gave me.
I like to use more than one
Okay.I will follow you.