Advanced attacks and courses in XSS, where can I find it?

Taking one of my last real courses before my master thesis now and it is in network security. Found XSS to be really fun to study so I decided to base my project on it. However, I have a real hard time to find “advanced” resources online. I have read papers on our library but most of them talk About XSS and Why it is bad and then a Very specific topic that they focus 10 pages on. I just want to really understand how to find these vulnerabilities (by hand or tools) and what can be done when I find one (for example a BeEF hook and similar stuff).

Where can I find courses/information like this?