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Shodan and Censys explained.

Shodan and Censys are search engines for internet-exposed devices – what they index, real query examples, the legal line, OPSEC and free-tier limits.

Cybersecurity 101: the words that mean what.

Threat, vulnerability, exploit, risk – four words that get used interchangeably, and the one mental model that finally separates them.

How networks actually work.

IP, TCP, DNS, TLS – traced through a single curl request. What each layer adds, and which ones an attacker can lie at.

Linux fundamentals for security, the working subset.

The 25 commands you will type every day, the five you will type in a hurry, and the file permissions that decide who owns the box.

Cryptography you can actually use.

Hashing vs encryption, symmetric vs asymmetric, and the three primitives you should reach for before rolling your own anything.

Threat modeling with STRIDE.

We pick a tiny web app and walk it through STRIDE, then write the prompt that gets an LLM to do 60% of the same work as a reviewer.