This document provides a simple guide to customer success. It outlines that customer success involves three levels: 1) the success of the customer, 2) the success of the customer success process and team, and 3) the success of the business. The primary goals are customer retention and upsell, which maximize customer lifetime value and business success. The customer success process involves onboarding, adoption, and escalations from both an account and user perspective. It also describes different types of engagement like onboarding, training, business reviews, and usage reviews that involve touchpoints by call, meeting, or email.