You can also look up for these other topics: Framework Coding Standards Boilerplate CMS Tool Security Hacktoberfest
ezXSS is an easy way for penetration testers and bug bounty hunters to test (blind) Cross Site Scripting.
㊙️ AntiXSS | Protection against Cross-site scripting (XSS) via PHP
this repository is a docker containing some "XSS vulnerability" challenges and bypass examples.