Avoiding dupes is, I think, an important one. We've had multiple instances on Beehaw of the same story showing up more than once. If you try to post a duplicate link, Lemmy will let you know (by showing the previous copies to you as crossposts). It's harder to make sure you're not posting the second or third story from a different source on the same topic. Perhaps we can just encourage people to search before posting.
I'd like the rules to at least ask people to add an image description in their original post. https://beehaw.org/post/686974 would be good to link to here.
And given the nature of many posts in the news, I think it would be good for this community to remind people to be(e) nice in their discussions.