Every resource founders actually use, in one library.

What founders use most, ranked by how many answers lean on it.

1. A long-form interview with the author of The Mom Test for when you want to hear the ideas in conversation. He goes deeper on... The Learning Leader Show Podcast · ~60 min · Starting Up How To Talk To Your Customers (The Mom Test) Rob Fitzpatrick (with Ryan Hawk)
2. A head-on comparison of the exact question you are asking, useful as an orientation before the deeper resources. It draws out... Bundl Article · 12 min read · Starting Up B2B vs B2C Venture Validation: Key Differences Bundl
3. A structured, free program that reverse-engineers how B2B startups actually find product-market fit, built from patterns across... First Round Course · multi-part guide · Starting Up The PMF Method First Round
4. Aulet, who runs MIT's entrepreneurship center, lays out how to do primary research properly: observe, listen, and interact with... VentureWell (Bill Aulet, MIT) Article · medium read · Starting Up A Practical Guide to Primary Market Research Bill Aulet
5. Written by an investor who founded and sold a marketplace himself, this is a structured handbook covering business models,... Version One Ventures Article · ~45 min read · Starting Up A Guide to Marketplaces Boris Wertz and Angela Tran
6. Grinda has backed over a thousand marketplaces, and his blunt take is that roughly 95 percent are demand constrained, not... Fabrice Grinda Essay · ~30 min read · Starting Up Lessons Learned Building Online Marketplaces Fabrice Grinda
7. Udemy's cofounder explains, with real numbers, how they hand recruited supply when cold calls failed, even creating a course... The Hustle Article · ~15 min read · Starting Up How Udemy Found Their First 1,000 Instructors Sam Parr
8. Video · ~35 min watch · Starting Up How to Kickstart and Scale a Marketplace Business (talk) Lenny Rachitsky
9. Video · ~50 min watch · Starting Up The Ultimate Guide to Two-Sided Marketplaces with Jeff Jordan Jeff Jordan and Harry Stebbings
10. Kromatic works with corporate and startup teams on lean experiments, and this piece is precise about the difference and the... Kromatic Article · Starting Up Wizard of Oz Prototyping vs. Concierge Test Kromatic
11. A structured how-to you can follow, covering when to run a Wizard of Oz test, the steps, the tools, and the pros and cons.... Learning Loop Template · Starting Up Wizard of Oz Experiment (play) Learning Loop
12. This entry frames the Wizard of Oz test as one experiment in a wider validation toolkit, with clear guidance on cost, evidence... Kromatic (The Real Startup Book) Template · Starting Up Wizard of Oz (The Real Startup Book) Kromatic (The Real Startup Book)
13. A practical walkthrough of when a concierge MVP is the right fit, when it is not, and how to actually run one. It is helpful... Upsilon Article · Starting Up What Is a Concierge MVP and When to Use It Upsilon
14. A tight 17 minute talk that distills The Mom Test into the one habit that matters most: stop presenting your idea, because... The Conference by Media Evolution Video · 17 min · Starting Up Rob Fitzpatrick: (not) presenting your idea Rob Fitzpatrick
15. The reference book on interview craft itself: how to build rapport, ask follow ups, and manage your own bias in the room.... Rosenfeld Media Book · 248 pages · Starting Up Interviewing Users: How to Uncover Compelling Insights (2nd Edition) Steve Portigal
16. A direct answer to the question every founder types into search: what should I actually ask. Torres argues for throwing away... Product Talk Article · 12 min read · Starting Up Ask Teresa: What Are the Best Customer Interview Questions? Teresa Torres
17. A founder story about doing customer research so carefully that you learn things you did not want to hear. It shows what... First Round Review Article · 20 min read · Starting Up Webflow's Path to Product-Market Fit: Lessons on Rigorous Customer Empathy First Round Review
18. A ready to use script for interviewing a recent customer about why they switched, built entirely around past behaviour and... Deploy Empathy Template · script · Starting Up Customer Interview Script Template: The JTBD Switch Interview Michele Hansen
19. A short, plain piece that names the exact trap in this question: a curiosity click reads as demand when it is not. It gives... saasvalidation.tech Article · Starting Up Pre-launch waitlists measure curiosity, not intent saasvalidation.tech
20. Video · ~45 min · Starting Up The Mom Test (author talk) Rob Fitzpatrick
21. A breakdown of how Superhuman turned a waitlist into a filter using onboarding calls, surveys, and referral gating, so joining... Waitlister Article · Starting Up Superhuman's Waitlist Case Study: 180K Users at $30/Month Waitlister
22. An Indian investor and operator describes validating product/market fit for under 100 dollars, using a scrappy live test rather... The Neon Show Podcast · Starting Up Sanjay Swamy: Validating Market Fit for Under $100 at ZipDial Siddhartha Ahluwalia
23. Kamath spells out a hard Indian truth: services that Americans pay a premium for, Indians expect for free, so the same feature... Business Today Article · Starting Up Robinhood charges for speed, India gives it free: Nithin Kamath drops a brutal reality check Nithin Kamath (via Business Today)
24. Pike weighs pre-selling honestly, including when a signed commitment truly validates demand and when it does not fit your... Allen Pike Essay · Starting Up Sell First, or Build First? Allen Pike

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