Dagster has released a free eBook titled 'Scaling Data Teams' aimed at data practitioners and teams of all sizes. The guide covers how to build and scale data platforms across four team stages: solo (1 person), small (5 people), growing (10 people), and enterprise (20 people). Each stage addresses specific challenges like balancing ad-hoc requests, building trust through testing, ensuring reliability with modular design, and establishing governance. The eBook includes real-world case studies from Dagster customers including Erewhon, StashAway, Vanta, and Otto.