Don't be afraid to push back on things when you can, if it's reasonable. You are the only person who values your personal time. Everyone else values their own, so will not hesitate to dump work on you under the guise of, "training" or, "learning opportunities".
Two, don't mistake legimate education and training for, "extra work" that frees up someone else.
Third, don't neglect to develop your EFFICIENCY in parallel with your PROFICIENCY.
Fourth, don't get too caught up in diagnostic labels. Ultimately, your diagnosis depends on what the patient tells you, and patients are biased and inaccurate in what they report. Concern yourself more with the symptoms they present with, the impairment or distress they cause, and what treatment methods make reasonable sense.
Fifth, it's never all biologic. Humans aren't that simple. Pay attention to the other stuff too.
Sixth, don't neglect your education in medicine. I cannot stress this enough. Don't go to your medicine wards saying, "Derp a derp I'm a psych intern I don't need to know nuttin!". The ER will try to admit psych patients with acute medical problems or patients with acute medical problems presenting with psych symptoms straight to you. You need to know enough to catch it. You also need to know enough that, when medicine or neuro, "rules out" any medical problems and tries to explain a patient's symptoms as psychiatric in nature, you understand when it isn't and can push back. Psych can sometimes become the default explanation for a bizarre medical presentation when people can't figure out exactly what's going on.
I'll reiterate the, "Three Rules of Psychiatry" a mentor once told me. I try my best to live by these rules.
1) The patient is the one with the disease
2) The patient is entitled to his or her illness
3) The psychiatrist goes home at 4:30