A Gentle Introduction to XSS

I wrote this article as a simple, no-stress intro to one of the most common vulnerabilities on the web today, XSS (Cross-Site Scripting). I tried to gear it towards people who might have a smattering of web technologies under their belt, but aren't professional developers. http://bughunting.guide/a-gentle-introduction-to-cross-site-scripting-xss/

I'd love to hear any suggestions for improving it. Thanks guys!