So the article alluded to reading books and hacking on your own. But for those who need some sort of curriculum, progress bar, or structure, what would HN recommend to get to some sort of level of competency in the infosec field (like intermediate level/beginner-advanced).
Book: Web Application Hacker Handbook http://www.wiley.com/WileyCDA/WileyTitle/productCd-111802647...
I've seen it highly recommended and if you're not familiar with the field it's a good overview of exploit types for web apps.
Online training for free or cheap: Cybrary - mostly okay, but free.
PluralSight - https://www.pluralsight.com/browse/it-ops/security
Coursera has a Cybersecurity Fundamentals specializationd that's pretty good - https://www.coursera.org/specializations/cyber-security
Other books, if you wanted to go down the reverse engineering route:
Assembly Language Step-by-Step: Programming with Linux
The IDA Pro Book (for the strangely hard to buy IDA Pro, but the free version is pretty good)
Practical Malware Analysis