Possibly those that turned out to be most useful were the importance (and resilience) of integrations (Box guy), the quest to try to create monopolistic situations (Palantir guy), importance of a North star KPI (Facebook guy). But the course has lots of other concepts (understand your customers by doing things that don't scale, focus on what customers want, not on what competitors do, etc).

Thiel is an outlier for me imo, that guy is gangsta