This applies to every one but newbies should keep in mind before posting ( I also sometimes forget in my enthusiasm to post).

First, state precisely and concisely what you are writing about.
Second, state on what basis/fact you are basing you opinion/comment on.
Last but not least, state your sources and background material so that the readers may verify your post.

Following these simple rules will reduce the chance of you anoying anyone and a forum to gang up on you.