CTFs are divided into 5 standard categories: Web, Crypto, Forensics, Rev (Reverse Engineering), and Pwn (Binary Exploitation). Start with PicoCTF: solve the 50-point web challenges (inspecting page source, modifying cookies, basic SQL injections), then learn Ghidra for reverse engineering simple binaries. The dopamine of finding your first flag is unmatched.

When you type `campusloop.space`: 1. Browser checks local cache 2. Queries Recursive Resolver (ISP or 1.1.1.1) 3. Resolver asks Root Nameserver -> TLD Nameserver (.space) -> Authoritative Nameserver 4. Authoritative nameserver returns the IP address A-record. All within 15 milliseconds across global fiber cables.

People assume open source means writing 5,000 lines of complex C code. My first accepted patch was simply fixing a documentation ambiguity in the eBPF networking subsystem and adding a test case. The review process taught me more about professional Git hygiene and code standards than any college lecture.