I am a professional penetration tester.
I usually practice at HackTheBox and VulnHub.
Needless to say, I'm really good at Linux.
I can teach concepts like SQL injections, WebApp analysis, command injections & using malware to root boxes.
I also know how to use applications like Metasploit, BurpSuite, OWASP Zap, John, gobuster.
I'm a 5 Starred freelancer & available for one-on-one classes.
Check out my reviews. The timing is negotiable.
If you need any information about other works of mine, let me know.