Part 1 — Zero to OnePart 1 — Zero to OneCopy pagePart 1 — Zero to One How to validate before you build and get your first customer before writing a line of code. Sections 1.1 Painkiller Test 1.2 Only Validation Counts 1.3 Reading Market 1.4 First Customer Before Code 1.5 Defining First Customer 1.6 Five Questions Framework 1.7 Mining Customer Language 1.8 B2B Vs B2C 1.9 Build Or Dont Last updated on April 12, 20260.6 Postmortem Files1.1 Painkiller Test