I think two sections might be most generically interesting or useful:
1. The interviews. There are 14 interviews with Sam Altman, Marc Andreessen, Patrick Collison, Joelle Emerson, Erin Fors, Reid Hoffman, Claire Hughes Johnson, Aaron Levie, Mariam Naficy, Keith Rabois, Naval Ravikant, Ruchi Sanghvi, Shannon Stubo Brayton, Hemant Taneja.
In some cases, their advice is at odds with my own. So I think the richness of perspectives and experiences are valuable.
2. The sections on executives, recruiting, people, onboarding, re-orgs, etc.
Startups are a team sport, and getting the right team together and helping them be effective is really the key (assuming you already have product/market fit).
A big part of that is also the role of the CEO, and the CEO managing their own psychology, not burning out, etc.