behavior that is considered to be proper and acceptable

शिष्टता

English Usage: It’s important to show common decency to everyone.

Hindi Usage: हर किसी के प्रति सामान्य शिष्टता दिखाना महत्वपूर्ण है।

of frequent occurrence; widespread

सामान्य

English Usage: It is a common misconception that all swans are white.

Hindi Usage: यह एक सामान्य भ्रांति है कि सभी हंस सफेद होते हैं।