This document discusses key metrics for SaaS startup success. It defines 8 important sales metrics: monthly recurring revenue (MRR), bookings, annual contract value (ACV), churn, cash efficiency ratio, magic number, lifetime value to customer acquisition cost ratio (LTV/CAC), and payback period. Each metric is explained with examples and notes on why it is important to measure. Target performance levels are listed for some metrics, such as aiming for a cash efficiency ratio over 10% and LTV/CAC ratio over 3x. The document concludes with a reminder that this list is not comprehensive and mentions some additional factors to track.