About bt0
Hi there! I am Humberto Jr (bt0), and this blog is my field notebook for information security, secure development, AppSec, bug bounty, AI security, threat intelligence, red team and blue team learning.
The focus is practical: tutorials, writeups, tools, research notes and checklists that help beginners and practitioners understand security with hands-on examples.
- Application security and secure development.
- Bug bounty methodology and responsible testing.
- Cybersecurity with artificial intelligence.
- Threat intelligence and OSINT workflows.
- Security tools, labs and writeups.