If you're interested in learning about ethical hacking, there are several legitimate courses and certifications available. Here are a few popular options:

1. Certified Ethical Hacker (CEH): The CEH certification is one of the most recognized certifications in the field of ethical hacking. It covers various topics such as network scanning, system hacking, web application security, and more.

2. Offensive Security Certified Professional (OSCP): The OSCP certification, offered by Offensive Security, focuses on practical, hands-on penetration testing skills. It requires participants to successfully complete a challenging 24-hour penetration testing exam.

3. CompTIA Security+: While not solely focused on ethical hacking, the CompTIA Security+ certification provides a broad foundation in cybersecurity, including topics such as network security, cryptography, and incident response.

4. SANS Institute: The SANS Institute offers a wide range of cybersecurity courses, including several focused on ethical hacking and penetration testing. Their courses are highly regarded and taught by industry experts.

5. EC-Council Certified Security Analyst (ECSA): The ECSA certification is designed to complement the CEH certification and provides a more in-depth understanding of the analytical phase of ethical hacking.

It's important to note that these courses and certifications require a strong foundation in computer networks, operating systems, and cybersecurity fundamentals. It's recommended to have some prior knowledge or experience in these areas before pursuing advanced ethical hacking courses.

Always ensure that you are using your skills responsibly and within legal and ethical boundaries. Ethical hacking should only be performed with proper authorization and for legitimate purposes.