Two people, one app: the ritual that re-tests everything you shipped

Module 0 is open to everyone, and so are the reference lessons (Module 1, and Module 2 Lessons 1–2). The rest of the practical route opens one step at a time as you complete it. Sign in to track your progress.

This lesson opens after you complete “Likes, then live: a count that moves the instant you click” (Module 4, Lesson 8).

Start at the beginning: Welcome