Don’t be offended if others leave.
Try not to have long one-on-one conversations in the group. Switch to private messages.
The group is not a political platform. No arguing, no heated opinions, no fear-mongering, no hyped-up drama, no fake news.
Never EVER use a group to berate someone else or air grievances. If you have an issue address it one on one with the relevant person.
Don’t send data-insensitive messages. No-one wants their last 3GB used up on uninvited memes.