This repository is a documentation-focused resource providing security guidelines for SaaS startups organized by company growth phases. It contains no executable code or data processing pipelines, but rather offers educational content in Markdown format covering topics from basic security hygiene (password management, encryption) to advanced compliance and incident response strategies. The material is structured as a practical guide referencing real-world scenarios and external resources, with accompanying images illustrating key concepts. While not a software project, it functions as a reusable knowledge base that engineers can reference when implementing security practices in early-stage startups.