📚 Resources 13 — Go Deeper on Operating Systems & Networks

All free, all reputable, none required. The first two are the gentlest.

🎬 Videos

Crash Course Computer Science — “Operating Systems” (episode 18) — a fast, funny 12-minute animation of scheduling, memory, and the kernel; the whole playlist’s networking episodes (28–31) continue into Part B territory. Best for a visual replay of this entire module.
“How does the Internet work?” by code.org — a short, famously clear video series featuring internet pioneers explaining packets, IP addresses, and DNS with real props. Best for anyone who wants Module 03 + this module’s Part B told by the people who built it.

Khan Academy — Computers and the Internet — patient lessons with self-check questions covering hardware, the internet, and online data. Best for learners who like reading at their own pace with quizzes along the way.
Cloudflare Learning Center — plain- English explainer articles on DNS, VPNs, firewalls, latency, and more, written by a company that runs a large chunk of the internet’s plumbing. Best as a lookup shelf whenever a networking word appears in the news.

fast.com — a one-button speed test run by Netflix; click “Show more info” for latency. Best for a ten-second check with zero clutter.
speedtest.net — the detailed classic: download, upload, and ping, with history if you want it. Best when you’re gathering evidence for a call to your internet provider.