don't ever fully trust anyone. you are always being watched, co-workers will always talk. be careful who you confide in. don't go out of your way to help a coworker who won't do the same for you. I know it sounds crappy but I've had too many coworkers who used my help, got promoted and never returned the favors. always. be. professional. its a job. don't be overly loyal to a place that will fire you the second it makes sense for them. do your job but don't sacrifice relationships or health for it. its not worth it. don't talk shit about anyone. if someone is gossiping about someone else to you, be sure they are gossiping about you to someone else. don't be late. make sure you understand exactly what the boss wants from you. I have had jobs where I thought I was killing it and others were mediocre - only to find out they were far more in tune with what management wants. don't let perfect be the enemy of good. be consistent. be nice. be polite. be a team player - but know how to stand up for yourself when its relevant.