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Cross-site leakage , XSS , SQLi , XXE , CSRF , and many more vulnerabilities have been tested by PentesterLab. HellBound Hackers The website lives up to its name, plus the name is catchy. It has a forum, articles, lessons, and hacking challenges. Web hacking, email tracking, software cracking, steganography, encryption challenges (which are decryption tasks), and even social engineering are all things you may practice.