http://xheax6bwicuando5pxdhevcmag66pd5u3kbh7plijixfghzix2wca2id.onion/index.php/hire-a-hacker/index.html
Protocols, SSH, the OSI model, and the TCP/IP paradigm are all things you should be familiar with. In addition, SQL injection, OWASP Top 10, SANS Top 25, Cross-Site Scripting, and Social Engineering techniques were used.