Please, thank you, and the basics of being polite.

• ಧನ್ಯವಾದThank you (standard)
• ಧನ್ಯವಾದಗಳುThank you (plural form, slightly more formal/emphatic)
• ದಯವಿಟ್ಟುPlease (lit. 'showing kindness')
• ಕ್ಷಮಿಸಿSorry / Excuse me (to apologize or get attention, polite)
• ಪರವಾಗಿಲ್ಲIt's okay / no problem / you're welcome
• ಹೌದುYes
• ಇಲ್ಲNo / there isn't
• ಸರಿOkay / alright / correct
• ಆಗಲಿOkay / sure / let it be so (agreement)
• ಸ್ವಲ್ಪA little / some (also used softly, like 'kindly' before a request)
• ಗೊತ್ತಿಲ್ಲI don't know
• ಅರ್ಥವಾಯಿತುI understood / understood