The guide provides a comprehensive overview of key performance indicators (KPIs) for eCommerce businesses, covering various aspects such as sales, marketing, customer service, manufacturing, and project management. It emphasizes the importance of setting relevant KPIs that align with business goals and industry standards, and using data analytics tools to track performance accurately. The guide offers 70 common eCommerce KPIs, categorized by area of business, to help businesses measure their progress toward specific objectives.