Guilherme Barcellos

I offer practical classes focused on offensive cybersecurity, explained in a clear way.

I teach fundamentals of malware, malware analysis, exploitation concepts, basic Red Team mindset, Windows security adjustments, and pentest, always focusing on how things work under the hood, not just theory or tools.

Although my main focus is offensive security, I can also cover related topics such as networking, programming basics, system behavior, and cybersecurity career guidance, depending on your goals.

This service is ideal for beginners or curious learners who want real understanding, not shortcuts or fake promises.