Tutorials

Multi-part courses — each teaches a language or tool by building real offensive tooling against one retired box, start to root.

Ruby for Pentesters
10 parts

RubyOffensiveBizness

Ruby from your first HTTP request to a working Metasploit module, taught by building a full exploit chain against the retired HackTheBox machine Bizness — recon, auth bypass, RCE, a reverse shell, looting, cracking, becoming root, tooling, testing, and the module.