After a couple of weeks you will start understanding why certain things are done and what things shouldn't be done. Please remember that people all over the world are reading your words. Do not attack people if you cannot persuade them with your presentation of the facts. Screaming, cursing, and abusing others only serves to make people think less of you and less willing to help you when you need it. If you are upset at something or someone, wait until you have had a chance to calm down and think about it.
Hasty words create more problems than they solve.
Try not to say anything to others you would not say to them in person in a room full of people. Maybe it is a case of the software not working, or a control message escaped, or maybe one of the users at that site has done something you feel requires comment. By being civil and temperate, you are more likely to obtain their courteous attention and assistance. Many people who post to Usenet do so from machines at their office or school. Some people put explicit disclaimers to this effect in their messages, but this is a good general rule.