Much of the communication in an online environment is text-based - you will be writing a lot. Think carefully before you post anything. Make sure that you words are clear, and that their style is appropriate for your audience and purpose (what's appropriate in a student chat room is very different from what's appropriate in an assessable discussion forum).
Take care with context
Text-based communication lacks the visual cues that we rely on in face-to-face communication, and your words might easily be misinterpreted. So be careful. Things that seem hilarious when spoken can fall-flat when written. Never use language that is racist, sexist or otherwise discriminatory.
Calm down first
Treat everyone with courtesy and respect and don’t be tempted to say anything when you are angry or frustrated. A good rule of thumb is if you wouldn’t say in in person, don’t write it. And if you wouldn’t want to see it published in on the front page, definitely don’t write it.
Be a responsible live-streamer
When you're not talking, mute your microphone. When you’re talking, make sure to unmute! And keep your background noise to a minimum. Be aware of what people can see in your background. While your cat climbing across your screen might be funny at first, it will quickly become a distraction and annoying to your group. Also be aware of things in your background that might be private, and will be visible to others when your web camera is on. Some online meeting applications allow you to blur your background - this is a great feature.
Ask for help more than usual
Because written communication lacks visual cues, your lecturer might not know when you are confused, or when they haven’t explained something clearly enough, or if you need help. You’ll need to be far more proactive than usual, and ask for help. It might feel awkward to talk with your lecturers this way (and it might be awkward for some of them too!), but don't be shy about using the Moodle tools to communicate.