What are the things to avoid when communicating?

I think that you should avoid being aggressive and negative.

While communicating, avoid making your mannerism.

Confidential informations, remember that when people or the management trusted you to keep information, it is something you should be proud of and should be protected.

Sometimes people intended to spread everything they know because they were thinking that it is a plus point for them but that works the other way because when you spread confidential information means you are untrusted.

Negative talking, negative suggestions.