Be courteous, helpful, and respectful to others
In my own career, I have been in some good IT departments and some bad ones. In a good IT department, the engineers are known for sharing knowledge and helping each other. In bad IT departments, the engineers are secretive and hide knowledge. How can everyone get better if some people are selfish with what they know? Information wants to be free. You must set it free. Despite the fact that I have been to several universities, graduate school, and have collected many IT certifications, I have still learned much more about IT from my fellow engineers than from all my higher education combined. So my advice is to be kind and respect your fellow IT staff. They are your family for eight hours every day, forty hours every week!