The evolution of technology and the Internet has produced many types of websites. Among the famous website's type is the informational and educational website. Many of these websites do not provide enough security measures and policies. In other words, these websites have security vulnerabilities that can be compromised by an attacker. Informational websites provide either general data or sensitive data such as religious information, hence appropriate security reasures must be considered to reduce vulnerabilities and mitigate future cybersecurity attacks. What most important is to take the first step to do website assessment. Therefore, in this book, a three stages security test is introduced as a guide to informational website security assessment. The aim of this book is to provide the three stages theory as well as assessment samples using 19 informational websites with different criteria. The security level for these sample websites and the security awareness is clearly described, investigated and evaluated using the three stages assessment.