As a web programmer, for whom the majority of this article is not only new, but difficult to comprehend, it makes me yearn to improve my web security knowledge. Any pointers?
Do some of your own hacking on hackthebox.com. It is shocking what can be done with only a week of security training by an already experienced programmer. It becomes clear that the typical software engineer doesn't give a single thought to security.
You can look at the disclosed reports on hackerone and get a feel for the kind of stuff that's being exploited and how it's being addressed.
Go through each line item in the article and create a proof of concept for yourself. You will learn a lot along the way too.