HackenProof - The world trusted Bug Bounty Platform for crypto projects
Hack The Box - An online platform to test and advance your skills in penetration testing and cyber security.
Cybrary - Free courses in cyber security
TryHackMe - TryHackMe is an online platform for learning and teaching cyber security, all through your browser.
CYREX - Web security vulnerability assessment & penetration testing
VulnHub - VulnHub provides materials allowing anyone to gain practical hands-on experience with digital security, computer applications and network administration tasks.