3 things to never do at work, according to an HR professional with 10 years' worth of experience

• Valerie Rodriguez, a human-resources director, says there are three things she never does in the workplace.
• She says oversharing at work can be harmful because it allows people to make decisions for you.
• Sticking around too long at company functions can also end negatively, she says.

This as-told-to essay is based on a conversation with Valerie Rodriguez, a 31-year-old human-resources director in New Jersey. It has been edited for length and clarity.