The definition of digital citizenship has to do with the quality of behaviors that impact the quality of digital content and communities.
To help clarify what that “quality” can look like, knowthenet.org.uk put together the following infographic framed around Dos and Don’ts. While seemingly written for a more general audience than students and educators, the thinking is sound, including “Treat others they way you want to be treated,” “Don’t forget the human behind the screen,” “Listen first, talk later,” and “Use proper grammar.” (Yes, please do.)