Operating at startups
Whether you founded or are working at a startup, execution is often what determines the outcomes.
This growth accounting framework is the best, quantitative method of measuring product market fit for startups that I've seen. Covers different metrics to look at for both consumer and B2B startups.
Comprehensive set of lectures that cover a lot of different aspects of the earliest stages of startups. In particular, love the Lecture 6 - Growth by Alex Schultz, which is related to the Growth accounting link because they're all inspired by former FB growth team.
Useful framework for how to think about startups as momentum flywheels that attract capital and talent to build better product, get more traction, and attract capital and talent... Not a big fan of the rest of the post beyond how they described this framework.