Formal:
* Bonne chance (pronounced bon shans) - This is the most common and general way to say "good luck."
* Je vous souhaite bonne chance (pronounced zhuh voo swee-tay bon shans) - This literally means "I wish you good luck" and is more formal.
Informal:
* Bonne chance! (pronounced bon shans) - This is the more common way to say "good luck" in an informal setting.
* Bien joué! (pronounced bee-an zhoo-ay) - This means "Good play!" and can be used to wish someone luck in a game or competition.
Other options:
* Tout le meilleur (pronounced too lay me-yur) - This means "All the best" and is a more general way to wish someone well.
* Que la force soit avec toi (pronounced kuh la fors swa a-vek twa) - This is a playful way to say "May the force be with you," like in Star Wars.
The best way to choose the right phrase depends on the situation and your relationship with the person you are talking to.