Course home
Short things to read before each lesson. A few minutes each, on your phone, nothing to install.
Every page has the same three parts: one big idea, something to think about, and a tiny challenge to bring with you. That's the whole job.
A computer follows instructions exactly — and that is the whole game.
LESSON 2a Everything is bits →Why a machine that only knows on and off can store anything at all.
LESSON 2b Encoding the world →Bits mean something only once we agree what they mean.