This is an announcement from Apache Cassandra about its new comprehensive data modeling series for 2025, designed to provide developers and architects with the latest knowledge on building modern applications. The series will cover Cassandra 5.0 as the basis for building an application, starting with foundational principles that remain unchanged even in newer versions of Cassandra. It will guide learners through a progressive learning journey using KillrVideo, a YouTube-like application, exploring revolutionary storage-attached indexes, enhanced data types and functions, data protection and governance, and practical migration strategies to modernize existing implementations. The series offers concrete techniques for implementing immediate improvements to data models, resulting in more intuitive, maintainable, and compliant applications that are optimized for performance at any scale.