This guide outlines the concept of Security Data Operations (SecDataOps), emphasizing its necessity in achieving better security outcomes through improved data management. It begins by discussing the critical role of data in security, noting how traditional security approaches have struggled to keep pace with the increasing scale and complexity of data. The document defines SecDataOps as the discipline of managing security data throughout its lifecycle to enhance detection, investigation, response, and automation capabilities. It details the fundamental principles and operating model of SecDataOps, highlighting the importance of deliberate data ownership and operational rigor. Furthermore, the guide explains common challenges security teams face, including data fragmentation and the impact of growing data volumes on security operations. It also discusses the limitations of existing security tools and the need for a coherent data strategy to support effective security initiatives. The guide ultimately advocates for a shift towards treating security data as a first-class operational concern to improve overall security program effectiveness.