Here are some ways to say hello and goodbye in Hindi:
Hello:
* Namaste (नमस्ते): The most common and respectful greeting.
* Shubh prabhat (शुभ प्रभात): Good morning.
* Shubh ratri (शुभ रात्रि): Good night.
* Kya haal hai? (क्या हाल है?): How are you?
* Aap kaise ho? (आप कैसे हो?): How are you? (more formal)
* Hello (हेलो): Used in more casual settings.
Goodbye:
* Shubh ratri (शुभ रात्रि): Good night.
* Aap ka din shubh ho (आप का दिन शुभ हो): Have a good day.
* Alvida (अलविदा): Goodbye (borrowed from Arabic).
* Khuda Hafiz (खुदा हाफिज): God bless you (borrowed from Arabic).
* Bye (बाय): Used in more casual settings.
Remember that Hindi is a very nuanced language, and the best way to greet someone depends on the context and your relationship with them.
Would you like to learn more about Hindi greetings or other aspects of the language?