op 5 Free Websites to Learn Hacking / Cyber-Security
Cybrary. Cybrary is a rather new site that offers a wide range of courses and classes spanning everything from basic networking to advanced penetration testing. ...
SecurityTube. ...
Harvard/EDX. ...
SANS Cyber Aces. ...
LEAP.

List of those websites :
1. Cybrary - https://www.cybrary.it
2. Hack-A-Day - https://hackaday.com
3. Learn Hacking - http://learnhacking.in
4. Hack This Site - https://www.hackthissite.org
5. From Dev - https://www.fromdev.com
6. Null Byte - https://null-byte.wonderhowto.com