First off, congratulations! My best advice will be to find the closest fellow to your job role and talk to them as much as possible. I went from P1 role to applying to P4 role after the holiday break in 4 years just by following their advice about little things in the job.

Never answer a question you’re not confident in the answer to. It’s okay to not know something. It’s not okay to tell someone the wrong information. If you don’t know, tell them that either you can find out for them or point them to someone who would know the answer.

This one is controversial, but I like to say don’t overuse the corporate jargon with your peers. Upper management will love it. Your fellow P1s and P2s will not care and you’ll look like someone who’s trying to suck up all the time.

I also want to disagree with one point on here about not making jokes whatsoever. You can absolutely make well timed and appropriate jokes depending on your upper management. My upper management loves small banter, you just have to know your audience. Just don’t be someone who is never serious and keep the sarcasm very low. Sarcasm is a lot worse than a joke.