Formal:
* विदाई (vidaai) - This is the most formal way to say goodbye.
* अलविदा (alvida) - This is a more common and widely used formal goodbye.
* शुभकामनाएँ (shubhkamnaayen) - This literally means "best wishes" and can be used as a formal goodbye.
Informal:
* खुदा हाफ़िज़ (khuda hafiz) - This means "God protect you" and is a common informal farewell.
* नमस्ते (namaste) - This is a respectful way to say goodbye.
* जय हिन्द (jay hind) - This means "victory to India" and is a patriotic farewell.
* चलो (chalo) - This means "let's go" and can be used as a casual goodbye.
* अच्छा (achchha) - This means "okay" and can be used as a casual goodbye.
More casual:
* बाय (bye) - This is a very casual way to say goodbye, borrowed from English.
* ताता (tata) - This is a very common informal way to say goodbye, especially among friends.
The best way to say goodbye in Hindi depends on the situation and the people you are talking to.