📖 Today’s lesson
Lesson 21: Build infrastructure, not one-offs.
A prompt library is marketing infrastructure: your voice spec, your brief format, your test-variant generator, saved as reusable templates with fill-in variables. Build once; the whole team inherits your quality.
Why this matters: Nineteen days of drills have already produced your starter library — today you systematize it. Teams with shared prompt libraries get consistent AI output; teams without get whatever each person improvises at 5 PM.