Things never share or discuss with your co-workers

What you earn is between you and Human Resources. Disclosure indicates you aren't capable of keeping a confidence.

"Nobody really cares about your aches and pains, your latest operation, your infertility woes or the contents of your medicine cabinet," To your employer, your constant medical issues make you seem like an expensive, high-risk employee.

Whomever you're gossiping with will undoubtedly tell others what you said. Plus, if a co-worker is gossiping with you, most likely he or she will gossip about you.

Constant complaints about your workload, stress levels or the company will quickly make you the kind of person who never gets invited to lunch. If you don't agree with company policies and procedures, address it through official channels or move on.

The spirit of keeping up with the Joneses is alive and well in the workplace, but you don't want others speculating on the lifestyle you're living or if you're living beyond your salary bracket.

Don't share intimate details about your personal life. Co-workers can and will use the information against you.

"People have strong, passionate views on both topics". You may alienate a co-worker or be viewed negatively in a way that could impact your career.

Breakups, divorces and baby-making plans should be shared only if there is a need to know. Otherwise, others will speak for your capabilities, desires and limitations on availability, whether there is any truth to their assumptions or not.

What you say in a social networking community or in your personal blog may be even more damaging than what you say in person. "Comments online can be seen by multiple eyes. An outburst of anger when you are having a bad day can blow up in your face."

If you don't agree with a co-worker's lifestyle, wardrobe or professional abilities, confront that person privately or keep it to yourself. The workplace is not the venue for controversy.

It's perfectly fine to have fun during the weekend, but don't talk about your wild adventures on Monday. That information can make you look unprofessional and unreliable.

"Failed marriages and volatile romances spell instability to an employer" . Office romances lead to gossip and broken hearts, so it's best to steer clear. "The safest way to play is to follow the rule, 'Never get your honey where you get your money.'"

You can assume your co-worker wouldn't be offended or would think something is funny, but you might be wrong. Never take that risk. Furthermore, even if you know for certain your colleague wouldn't mind your comment, don't talk about it at work. Others can easily overhear.