Look at these questions:
Où habites-tu ?Where do you live?
Tu habites où ?Where do you live?
Où habitez-vous ?Where do you live?
Vous habitez où ?Where do you live?
Note that there are different ways to ask a question in French.
Now look at these answers:
J'habite à Paris.I live in Paris.
J'habite à Londres.I live in London.
J'habite à Atlanta.I live in Atlanta.
To say which city you live in in French, you can use the verb habiter (to live [somewhere]) as such:
J'habite à + [city]
Note that je (= I) becomes j' in front of the mute h of habite.
See also Je becomes j' with verbs beginning with a vowel (elision)
See more complex cases in Using 'à' (to/in) and 'de' (from/of) with cities (prepositions)
See also the more advanced lesson on how to conjugate all six forms of habiter in Le Présent:
Conjugate regular -er verbs in the present tense in French (Le Présent)
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