This document provides guidance on identifying and tracking users for marketing purposes. It discusses when and how to identify users, including using email, account creation date, and client-side and server-side methods. Good user traits to track are listed, and it is noted that analytics can help segment targeted users. Funnel events and a sample funnel format are presented, including examples for e-commerce and an art website. Maintaining an analytics strategy is important for testing, understanding user behavior, and determining next steps. The document emphasizes establishing a finite set of standardized event names and properties for consistency.