Netiquette
Netiquette is etiquette on the internet. In an online course you communicate almost entirely in writing, with classmates and your instructor, so clear and professional communication matters. The basic rule: do not write online what you would not say in person.
Canvas Inbox and Discord
Send a message only to the people who need it, and avoid messaging the whole class unless everyone must read it. Use a descriptive subject or opening line (course and topic). Do not write in all capital letters, which reads as shouting, and never post a message meant to insult or provoke. Sign your name; do not assume your instructor knows who you are from your screen name.
Professionalism and Courtesy
Show the same respect online that you would in a classroom or a workplace. Use sarcasm with care: without tone of voice and facial expressions, it is easily misread.
Spelling and Grammar
Use correct spelling and grammar, and avoid texting abbreviations. Drafting a longer message in a document first lets you check it before you send it.
Tone
Review your message before you select Send or Post. Ask yourself whether you would say it to the person face to face, and how someone else might read it. You are writing to people of every age and background.