The tweet advises beginners learning about XSS vulnerabilities not to limit themselves to basic alert box pop-ups, which are common in CTF challenges. It emphasizes that real-world XSS attacks are more complex and that techniques that work in CTFs may not work against real-world web application defenses, such as filters and WAFs (Web Application Firewalls). The tweet encourages learners to explore advanced filter and WAF bypass techniques to better understand and exploit XSS vulnerabilities in practical scenarios.
Check out the original tweet here: https://twitter.com/40sp3l/status/1937461636757135378