Start here - http://brutelogic.com.br/blog/xss101/
Then here - https://excess-xss.com/
Practice XSS - https://xss-game.appspot.com/level1
VM - https://www.vulnhub.com/entry/pentester-lab-web-for-pentester,71/
Start here - http://brutelogic.com.br/blog/xss101/
Then here - https://excess-xss.com/
Practice XSS - https://xss-game.appspot.com/level1
VM - https://www.vulnhub.com/entry/pentester-lab-web-for-pentester,71/