• PortSwigger Content ( Important )
• PortSwigger Labs ( Important )
• Bug Bounty Bootcamp Chapter 6
• Real World Bug Hunting Chapter 17

Labs & Resources:

• https://www.bugbountyhunter.com/vulnerability/?type=xss
• https://portswigger.net/web-security/cross-site-scripting/cheat-sheet
• https://cheatsheetseries.owasp.org/cheatsheets/XSS_Filter_Evasion_Cheat_Sheet.html
• https://xss-game.appspot.com/
• https://xss-quiz.int21h.jp/
• https://alf.nu/alert1?world=alert&level=alert0

Recon