Bonjour !!
Vous allez bien ? ► "Are you doing well ?" plural you <em>OR</em> formal you
this is a question using the intonation...
same as "Est-ce que vous allez bien ?"
<em>OR</em>
"Allez-vous bien ?"
You can translate with the plural "you" (you all) 2nd person plural or with the formal you for persons you don't know well....(only one person)
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Ça va ? ► "You're OK? "
this means the same as the 1st one, and you'll use it to someone you know well...informal
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Tu vas bien ? ► "Are you doing well ?" <em>informal</em>
question with the informal you....2nd person singular. For a friend, someone close you know well...
Est-ce que tu vas bien ?
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Je vais bien ? ► I'm doing well. ...
it can't be a question but an affirmation.
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Hope this helps ☺☺☺