Hack The Box (.eu) is a website that started in 2017 to help penetration testers (and hackers alike) test their skills and show off what they know in a legal fashion. To join the website you have to hack the invite code, which is perfect for any hacking site to help keep down the riff raff. To get the invite code you need to do 3 things:
- Find where the code is made/tested
- Send a POST request to get a new code
- Decipher the code and use it
There are other website that will tell you exactly how to do it, but I suggest you try on your own. Even if it takes days to figure out, at least you did it and didn’t just follow someones guide to help you get access. The point of the website is to gain more knowledge about software and network security. When you gain access you will see a screen like the one below.