Don't type in all uppercase letters. Also, even if you are not an expert typist, try to spell and punctuate correctly. You will find posts that contain so many typos that they are undecipherable. Don't use profanity and Don't try to sell things in a chat room. Since chat rooms move quickly, many shortcuts and emoticons have developed.
Emoticons are keyboard characters that are used to show emotion.
As you view these, turn your head to the left to see the meaning. Yawning You will also see many acronyms. They were very popular before the advent of chat rooms and other boards. To access a Bulletin Board Service, you usually have to dial a special telephone number. They are text oriented and have their own, old-fashioned, protocol.