Congratulations! After what seemed like an endless job search, nerve-wracking phone interviews, and meeting with what seemed like every person in the company, you got the job! It's easy to assume that the worst is over. After all, you've jumped through the hoops and convinced everyone that you were the best candidate. What more can they ask for? A lot, actually. Your first few weeks in a new company are crucial. This isn't referring to the technical skills of your job; it should go without saying that you need to excel at that part. How you behave in your new work environment, however, is just as important (if not more so) than your actual skill level when it comes to your new position. So, when you're starting your dream job, be sure to avoid making these deadly, career-killing sins.