The advice at the end is spot on.
It also turned out that the best way to appear generous was actually to be generous since false displays of generosity were usually discovered and resulted in ostracism
I'll help anyone out at work. I'll teach anyone anything I know. I will never throw someone else under the bus. I'll take credit with "we" and blame with "I".
I've been rewarded for this behavior at the places I've worked at.