In this video, I explain clearly and practically how Spark works in Microsoft Fabric, focusing directly on the DP-700 (Data Engineer) exam. We cover: What a Starter Pool is and when to use it When and why to create a Custom Spark Pool Where to manage Spark Pools and Environments Differences between using a default pool and environments per notebook Concurrency in Spark and the option to reserve cores Best practices that appear in DP-700 questions This content is not theoretical. It's designed to help you make the right decisions in exam scenarios and real-world projects with Microsoft Fabric. If you're preparing for the DP-700 or work as a Data Engineer in Fabric, this video will save you a lot of time and confusion. Subscribe if you want more practical content focused on certifications and real-world architecture in Microsoft Fabric.