Ethical hacking and penetration testing are essential in contemporary cybersecurity, as they proactively detect vulnerabilities prior to exploitation by malevolent entities. This chapter delineates the fundamental principles of ethical hacking, highlighting the ethical, legal, and professional parameters that differentiate it from malevolent hacking. It underscores the significance of comprehending attacker psychologies, the changing danger environments, and the need for systematic, reproducible testing approaches to guarantee effective security evaluations. The chapter also examines prevalent penetration testing approaches and frameworks utilized in industry practice. Ultimately, it directs learners in configuring a virtualized laboratory environment, facilitating practical experimentation and skill enhancement in a regulated and ethical context. This chapter equips learners with both theoretical understanding and practical preparedness for advanced subjects in penetration testing and offensive security.