This guidebook aims to present a wide spectrum of technological perspectives on IoT Security. It is a comprehensive document that covers IoT communication protocols as well as advice for building architectures for designing and developing IoT applications. The document offers recommendations on strategies to deal with common security threats and flaws in IoT services. It is intended to give a set of design recommendations for developing a secure product for IoT service providers. Further, it also highlights the solutions among different Industries such as Huawei’s IoT solution security architecture (the 3T + 1M framework), LTTS IoT Security Framework, oneM2M Standards, and Zero Trust Architecture.