Good luck — literally "into the wolf's mouth."
Saying "buona fortuna" is considered bad luck, so Italians use this instead. The required reply is "crepi il lupo" (may the wolf die) or just "crepi." Getting the reply right is a real insider marker.
Answering "grazie" is the learner giveaway. The answer is "crepi."
Reading a definition isn't the same as saying it to someone. Lingo Kaiava is a voice tutor set to Italian — it uses in bocca al lupo the way locals do, corrects you in the moment, and never "fixes" the way real people actually talk into textbook Italian.
Free to start. No signup for your first conversation.