Courses from 1000+ universities
17 years ago, Krishna Kumar started offering free PMP prep online. Today, it’s a leading digital upskilling platform that helps millions upskill in AI, cybersecurity, data science, and more.
600 Free Google Certifications
Digital Marketing
Computer Science
Marketing
Anatomy: Know Your Abdomen
Tsinghua Chinese: Start Talking with 1.3 Billion People
Discover Dentistry
Organize and share your learning with Class Central Lists.
View our Lists Showcase
Hands-on web application hacking, CTF, and bug-bounty training platform created by Ben "NahamSec" Sadeghipour.
Learn how to find and exploit the #1 vulnerability on the OWASP Top 10 using a fully built medical patient portal with over a dozen real-world bugs.
Dive into the open-source tool redefining bug bounties: scan at scale, craft custom templates, utilise ai and find what others miss.
Learn regex to match, extract, and bypass with hands-on labs and real-world hacking scenarios.
Master Blind XSS with NahamSec: real labs, real methods, and the exact process behind real bugs.
Linux is key for hackers, and John Hammond's Linux Fundamentals for Hackers fast-tracks your command-line skills. Learn privilege escalation, scripting, backdoors, and more to gain a hacker’s edge in
Get personalized course recommendations, track subjects and courses with reminders, and more.