3 lessons
How bits become wires, light, and radio waves
What is physically happening inside a cable or through the air when a computer sends a 0 or a 1.
Bandwidth, latency, and throughput
The three numbers that actually decide whether your internet "feels fast," and the math connecting all three.
Noise, errors, and how we catch them
Why bits flip during transmission, and the simple math (parity and checksums) used to catch it before it causes real damage.