Today, the world depends on services that run on the IT environments. These services, essentials for the modern world functioning constantly suffer attacks and invasions. This kind of preoccupation is true and must be a top priority for an IT security professional. This book will help you explore different techniques to locate, understand, and fix vulnerabilities that may exist in an IT infrastructure environment. The book starts by sharing the findings of professionals who are looking to create a secure IT environment. It then focuses on the building blocks of vulnerability assessment, tools, and frameworks that will help you find and map IT vulnerabilities. Moving on, the book deep dives into Network segregation and separation. It then shows you how to secure and harden your web servers using Apache and Nginx. Lastly, the book explains how to apply important hardening techniques to avoid operating system threats. By the end of the book, you will learn how to improve the overall security through Vulnerability Management.