focus on the cybersecurity domain, specifically detailing ethical hacking, penetration testing, and security methodologies. The first source from GeeksforGeeks outlines a broad range of computer science and networking topics, indicating its nature as an educational resource, while the second source from Resumly.ai provides granular salary and career growth data for Ethical Hackers, including compensation based on experience, location, and specialization. The third and most extensive source, the OSSTMM 3 manual, describes a rigorous, scientific methodology for characterizing Operational Security (OpSec) through various testing types like penetration tests and social engineering, introducing concepts like the rav metric for measuring attack surface. Finally, the fourth source from Imperva specifically defines and categorizes social engineering attacks, such as phishing and baiting, highlighting their reliance on human psychological manipulation.