Learning point 9 early will save you a lot of pain.
I'd add this:
Care about your job, do your best, learn, grow. It'll serve your career and it'll serve your happiness/satisfaction.
HOWEVER, accept that things will go wrong/dumb decisions will be made, and it's not all up to you to fix. If other people make dumb moves, you don't have to die on the hill. Let others fail, it's good for them too. I promise you that nobody will actually care after it's over. It's not worth the mental agony.
I hit this just recently here. Discussing a simple math problem that happened to be attached to a political point ended up w/ me getting downvoted by a person who I actually agreed with, but they couldn't see past their own nose to understand what I was saying.
I'm not mad about anything, or arguing policy about student loans. I'm just stating a fact - spending will decrease when people have less cash to spend. Why is that controversial?
When my $500/month student loan payments kick back in, you better bet I'm not going to be spending that $500/month on toys. This is about absolute dollars spent.