5. EchoCTF — Interactive Learning. @echoCTF 6. Vuln Machines — Videos and Labs. @Vulnmachines 7. Try2Hack — Interactive Learning. 8. Pentester Land — Written Content. @PentesterLand
9. Checkmarx — Interactive Learning. @Checkmarx 10. Cybrary — Written Content and Labs. @cybraryIT 11. RangeForce — Interactive Exercises. @RangeForce 12. Vuln Hub — Written Content and Labs. @VulnHub
13. TCM Security — Interactive Learning. @TCMSecurity 14. HackXpert — Written Content and Labs. 15. Try Hack Me — Written Content and Labs. @RealTryHackMe 16. OverTheWire — Written Content and Labs. @OverTheWireCTF
17. Hack The Box — Written Content and Labs. @hackthebox_eu 18. CyberSecLabs — Written Content and Labs. 19. Pentester Academy — Written Content and Labs. @SecurityTube 20. Bug Bounty Reports Explained YouTube — Videos. @gregxsunday
21. Web Security Academy — Written Content and Labs. @WebSecAcademy 22. Securibee's Infosec Resources — Written Content. @securibee 23. Jhaddix Bug Bounty Repository — Written Content. @Jhaddix 24. Zseano's Free Bug Bounty Methodology — Free Ebook. @zseano
25. Awesome AppSec GitHub Repository — Written Content. 26. NahamSec's Bug Bounty Beginner Repository — Written Content. @NahamSec 27. Kontra Application Security Training — Interactive Learning. 28. SANS Cyber Aces — Online Tutorials @SANSInstitute
29. CS406: Information Security — Saylor Academy 30. Network Defense Essentials — Cover6 Solutions 31. IBM Security Learning Academy 32. Linux BASH Shell Script Basics — Joe Collins
1. An experienced cybersecurity expert, consultant, and writer. Worth reading his blogs, curated newsletters, essays, podcasts, and high-quality writing. @DanielMiessler