HackTheBox

Hack The Box (HTB) is an online platform that provides hands-on cybersecurity training through real-world penetration testing challenges. It offers a variety of machines and challenges for users to test and improve their ethical hacking skills.

CTF

Capture the Flag (CTF) in computer security is an exercise in which participants attempt to find text strings, called “flags”, which are secretly hidden in purposefully-vulnerable programs or websites.