Hack The Box (HTB) challenges have become a popular way to test new techniques, hone your skills, and create content. These labs can be quite fun, as it’s not usually a single person creating a whole course, but are generally one-off scenarios (so there’s no stress to not finishing).
While “Hack The Box” is a company name that hosts some, these challenges can be included in CTFs, and well as a good way of demonstrating new tooling in an environment that was set up specifically for that purpose.
HTB (HackTheBox), “Emdee Five For Life” Instance (Docker), Python3, Oracle VirtualBox, PopOS (Ubuntu 20.4) VM