H4cker

H4cker is a free, community-driven GitHub repository curated by Omar Santos that indexes thousands of resources for ethical hacking, bug bounty hunting, DFIR, exploit development, reverse engineering, and AI security. It is built for self-paced learners who want one entry point into a sprawling field instead of twenty browser tabs of bookmarks. Rather than being a tool you run, it is an organized reference index: structured directories across 13 cybersecurity domains, certification roadmaps for Cisco, CompTIA, and ISC2, lab-building guidance with cyber range references, training cheat sheets, and exploit development scripts and proof-of-concept code. Code in the repo leans heavily on Jupyter Notebook and Python, so the hands-on material is mostly readable, runnable, and forkable. The AI security section covers LLM engineering and emerging attack vectors, which keeps it relevant for researchers tracking how offensive work is shifting toward AI systems. Over 4,000 commits and 45 contributors keep it moving, and contributions arrive through pull requests under an MIT license. It also works as supplemental material for Omar Santos' books, video courses, and live training, with H4cker linking out to Hacker Training (hackertraining.org) for structured instruction. That combination is the point: the repo is the map, the linked labs and courses are the territory. If you are building a cybersecurity learning path from scratch and want to avoid vendor lock-in and cost, this gives you a spine to hang it on. Positioned against Hack The Box, TryHackMe, and managed security platforms, H4cker is neither a lab environment nor a product. There is no GUI, no SLA, and nobody to call. It is an index that assumes you will go practice somewhere else.