1. Be civil. Give each other the benefit of the doubt! Disagree respectfully, not scathingly. Criticise thoughtfully, not harshly. Ultimately, a cruel comment rarely has any good-faith purpose; usually it's just for the pleasure of feeling superior. We don't need that here.
2. Include details in your titles. If you're posting about full-frame or APSC, say it in your title. If you're seeking lens advice, include something about the purpose in your title.
3. If you're planning a "look what I just ordered..." post with a photo of a box or a screengrab of an order, please reconsider. Maybe wait until it arrives, and show us some photos you're proud of!
4. Do we need more rules..? I hope not, but we'll see!