Formal:
* नमस्ते (Namaste): This is the most common and respectful greeting. It literally means "I bow to you."
* शुभ प्रभात (Shubh prabhaat): This means "Good morning."
* शुभ संध्या (Shubh sandhya): This means "Good evening."
Informal:
* नमस्कार (Namaskar): This is a more casual greeting, but still respectful.
* काय हाल आहे? (Kay haal aahe?): This literally means "How are you?" and is a common way to say hello in the Marathi language, which is spoken in some parts of India.
* क्या हाल है? (Kya haal hai?): This is the Hindi equivalent of "How are you?".
Other options:
* आप कैसे हैं? (Aap kaise hain?): This means "How are you?" and is a formal way to ask how someone is doing.
* कैसे हैं? (Kaise hain?): This is a more informal version of "How are you?".
The best way to choose a greeting is to consider the context and your relationship with the person you are greeting. If you are unsure, it is always safe to use Namaste.