This is a tool for hacking and hacker. This is a tool not only for hackers but also students that are learning hacking.
As some of you might have guessed, it's a place where you hack. So hack the box gives a machines with problems for you to go ahead hack them. They go so far that to sign up you must hack the website (if you count inspecting a website hacking. but there is a little bit more to it)in a way to sign up.
Yes you should use hack the box you can like really get into it and it's fun when you get the hang of it. And a great place to practice and try out your skills. Plus this will remove the need for you to buy or build another computer with problems to hack into.
Disclaimer: Do not just go to hack the box without any knowledge and try and hack that will ruin the experience for you.