Here are 27 ways to learn ethical hacking for free:

  1. Root Me — Challenges.
  2. Stök’s YouTube — Videos.
  3. Hacker101 Videos — Videos.
  4. InsiderPhD YouTube — Videos.
  5. EchoCTF — Interactive Learning.
  6. Vuln Machines — Videos and Labs.
  7. Try2Hack — Interactive Learning.
  8. Pentester Land — Written Content.
  9. Checkmarx — Interactive Learning.
  10. Cybrary — Written Content and Labs.
  11. RangeForce — Interactive Exercises.
  12. Vuln Hub — Written Content and Labs.
  13. TCM Security — Interactive Learning.
  14. HackXpert — Written Content and Labs.
  15. Try Hack Me — Written Content and Labs.
  16. OverTheWire — Written Content and Labs.
  17. Hack The Box — Written Content and Labs.
  18. CyberSecLabs — Written Content and Labs.
  19. Pentester Academy — Written Content and Labs.
  20. Bug Bounty Reports Explained YouTube — Videos.
  21. Web Security Academy — Written Content and Labs.
  22. Securibee’s Infosec Resources — Written Content.
  23. Jhaddix Bug Bounty Repository — Written Content.
  24. Zseano’s Free Bug Bounty Methodology — Free Ebook.
  25. Awesome AppSec GitHub Repository — Written Content.
  26. NahamSec’s Bug Bounty Beginner Repository — Written Content.
  27. Kontra Application Security Training — Interactive Learning.

Credit: @danielmakelley