The second part of a series on Apache Kafka delves into its storage fundamentals, focusing on the concepts of topics, partitions, and brokers, which are essential for Kafka's scalability, elasticity, and fault tolerance. Topics in Kafka serve as the storage layer where events are durably stored and can be configured with settings like data retention policies. Partitions, a key element, allow for distributed data placement, enabling better scalability and fault tolerance through replication. Kafka's architecture decouples event producers from consumers, allowing for efficient event partitioning and processing in parallel, which is vital for stream processing applications. The article highlights that proper event partitioning is crucial for maintaining event order and load distribution across partitions, recommending strategies such as over-partitioning to ensure scalable performance. The understanding of these storage concepts sets the stage for the next part of the series, which will explore Kafka's processing capabilities through streams, tables, and data contracts.