This guide outlines the essential steps for marketers to effectively manage data for artificial intelligence (AI) systems. It emphasizes the importance of using trustworthy data sources to train AI, starting with first-party data and enhancing it with reliable third-party insights. Regular data hygiene checks are highlighted as crucial for maintaining data accuracy, given that customer data can decay over time. The guide also discusses the establishment of a robust identity spine, which connects various customer signals across multiple channels to create a unified view of the customer journey. Furthermore, it addresses the necessity of obtaining explicit consent for data collection and usage, aligning with legal requirements and ethical considerations. By following these steps, marketers can ensure that their AI systems are powered by clean and ethically sourced data, ultimately enhancing customer engagement and experience.