Hack The Box - An online platform to test and advance your skills in penetration testing and cyber security.
TryHackMe - TryHackMe is an online platform for learning and teaching cyber security, all through your browser.
VulnHub - VulnHub provides materials allowing anyone to gain practical hands-on experience with digital security, computer applications and network administration tasks.
PentesterLab - Learn all about web hacking through online courses spanning the basics to advanced vulnerabilities
HackThisSite - Hack This Site is a legal free training ground for users to test and expand their hacking skills.
LetsDefend - LetsDefend is a security operation center analysis and response training platform that provides a full lifecycle of learning modules in the form of courses, labs, and exercises to help organizations meet their compliance and cyber-resilience needs.