How are you? / How's it going? /

How do you do?

(informal)

How are you? / How do you do?

(formal)

Fine, thanks.

(Informal response to 'How are you?')

I'm doing fine. / I'm fine.

(Response to 'How are you?')

[Literally, "It goes good to me."]

And how are you?

(Polite form.  Follow up question to being asked how one is doing)

[Literally, "And how goes it to you?"]

I'm fine too. /

I'm also (doing/feeling) fine.

[Literally, "It also goes good to me."]

Es geht mir auch gut. /

Mir geht es auch gut. /

Mir geht's auch gut.

Do you know me?

(Polite form)

Yes, I know you.

(Polite form)

No, I don't know you.

(Polite form)

Do you remember me?

(Polite form)

[= "Do you know me still?"]

Yes, I remember you.

(Polite form)

[= "Yes, I know you still."]