The most polite and standard response to "Bonjour" (Hello / Good day) in French is simply repeating "Bonjour" back to the person, often accompanied by their title if appropriate (such as Bonjour, monsieur or Bonjour, madame). In more casual settings among friends, you can reply with "Salut!" (Hi!) or ask how they are doing by saying "Ça va?" (How is it going?).
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