How do you answer to tu parles français in French?

Answer 1

Tu parles français ? means "do you speak French? You can answer:
- je parle juste un peu français; (I speak only a few / some French)
- je commence juste � apprendre le français; (I'm just beginning to learn French)
- je parle parfaitement français (I speak French perfectly)
or anything appropriate to your level.

Answer 2

"parles-tu français" is certainly very correct, but a bit precious. "Tu parles français" is sometimes deemed not grammatically correct, but the fact is that this is the phrase that a vast majority of French speakers will use (in fact it is unlikely that anyone should see any fault in using it)

Answer 3

"tu parles vraiment français ?" means "do you really speak French?". (the answer should be "non")