This document discusses analytics for startups and outlines 4 gateways and associated metrics for measuring progress through each gateway. The 4 gateways are: 1) determining if the startup idea is viable, 2) validating that the product is good enough, 3) establishing that growth can be achieved, and 4) ensuring a stable business model. Key metrics discussed include monthly recurring revenue, churn, lifetime value, acquisition cost, product/market fit, and metrics specific to SaaS, e-commerce and consumer tech business models like virality, monthly active users, and acquisition funnels. The document stresses the importance of focusing on the biggest constraints and tracking a few key metrics to measure progress against those constraints.