Every resource founders actually use, in one library.

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

1. Jackson breaks fit into levels and asks how acute the problem is, how reachable the audience is, and how differentiated your... Lenny's Newsletter Article · about 20 min read · Starting Up A Framework for Finding Product-Market Fit Todd Jackson (First Round Capital) In 4 answers
2. A step by step process for taking an idea to something people want without building the wrong product first. Maurya's mantra,... Ash Maurya (O'Reilly) Book · ~336 pages · Starting Up Running Lean (3rd Edition) Ash Maurya In 4 answers
3. A short, free primer straight from the person who coined the term, useful when someone on your team thinks an MVP just means a... Lean Startup Co. Article · ~8 min read · Starting Up What Is an MVP? Eric Ries Explains Eric Ries In 4 answers
4. A clean, practical playbook for the mechanics: where to place the door, what to measure, and how to avoid annoying the people... Learning Loop Article · ~12 min read · Starting Up Fake Door Testing: What It Is and How to Run One Learning Loop In 4 answers
5. The qualitative half of the answer, told through founders describing the moment things flipped: inbound you cannot keep up... Lenny's Newsletter Article · ~2,000 words · Starting Up What it feels like when you've found product-market fit Lenny Rachitsky In 4 answers
6. A useful correction for founders chasing a market-wide 40 percent before a single cohort loves the product. The authors argue... Andreessen Horowitz (a16z) Article · ~2,000 words · Starting Up Product-User Fit Comes Before Product-Market Fit Peter Lauten and David Ulevitch In 4 answers
7. Lenny interviewed dozens of people who built Airbnb, DoorDash, Thumbtack, Etsy, and Uber, then distilled how they actually got... Lenny's Newsletter Article · ~25 min read · Starting Up How to Kickstart and Scale a Marketplace Business (Part 1) Lenny Rachitsky In 4 answers
8. Cohen bootstrapped two companies past a hundred million in revenue, and he is blunt that a typical launch converts around one... A Smart Bear (Jason Cohen) Essay · 15 min read · Starting Up Excuse Me, Is There a Problem? Jason Cohen In 4 answers
9. The other side of the question, honestly told, including when a coordinated launch is actually the wrong move. It shows how... Lenny's Newsletter Article · 15 min read · Starting Up How to Successfully Launch on Product Hunt (When It's Right for Your Startup) Leo Bosuener In 4 answers
10. A practical, structured playbook for the exact fear in this question: users quietly leaking away. Lenny breaks retention into... Lenny's Newsletter Article · ~15 min read · Starting Up How to Increase Your Product's Retention Lenny Rachitsky In 4 answers
11. This is the two sentence post that named the whole category you are deciding about, from an OpenAI co-founder. Read it to... Andrej Karpathy (X) Thread · 1 min read · Starting Up The original "vibe coding" tweet Andrej Karpathy In 4 answers
12. A clear, tool by tool guide to turning an idea into a working prototype in minutes, aimed at people who do not code. It sorts... Lenny's Newsletter Article · 25 min read · Starting Up A guide to AI prototyping for product managers Colin Matthews In 4 answers
13. Context on how Indian founders are actually using no-code to launch without engineering teams, with real examples. It is useful... KrASIA Article · Starting Up Indian Founders Say Yes to No-Code Tools Shreya Asopa In 4 answers
14. A free, fast preview of the Refactoring UI mindset that you can apply this afternoon. It gives you seven fixes (use more white... Refactoring UI (Medium) Article · 10 min read · Starting Up 7 Practical Tips for Cheating at Design Adam Wathan and Steve Schoger In 4 answers
15. A deep, practitioner heavy set of guides from operators who built strong technical teams from scratch, useful once you commit... First Round Review Article · long read · Starting Up Hiring engineers First Round Review In 4 answers
16. Finding a great engineer is only half the battle when everyone is competing for them, and this piece is about the other half:... Y Combinator Startup Library Article · Medium read · Starting Up Convincing engineers to join your team Y Combinator In 4 answers
17. A venture firm's field guide to engineering hiring for founders, covering the full arc from defining the role to sourcing,... CRV Article · Long read · Starting Up How to Hire Engineers: A Guide for Founders CRV In 4 answers
18. A clean primer if you have never run a test. It defines the three pieces that matter (a facilitator who does not lead,... Nielsen Norman Group Article · ~12 min read · Starting Up Usability Testing 101 Kate Moran In 4 answers
19. A tight distillation of what YC drills into every batch, with launch quickly and iterate as a core plank. It is the checklist... Michael Seibel (michaelseibel.com) Article · 10 min read · Starting Up YC's Essential Startup Advice Geoff Ralston, Michael Seibel In 4 answers
20. A transcript of a real switch interview so you can hear what a great customer conversation actually sounds like. Reading it... Jobs to be Done Radio Article · Starting Up The Jobs to be Done Mattress Interview Jobs to be Done Radio In 4 answers
21. Cagan argues your job is to deliver outcomes, not to maintain a prioritized list of everyone's requests. That is the backbone... Silicon Valley Product Group (Marty Cagan) Essay · 10 min read · Starting Up Product Roadmaps Marty Cagan In 4 answers
22. A counterweight for when you overcorrect into safe, small, derivative ideas. Graham describes why the biggest ideas often feel... Paul Graham (paulgraham.com) Essay · ~12 min read · Starting Up Frighteningly Ambitious Startup Ideas Paul Graham In 4 answers
23. This one focuses squarely on the method your short answer champions, building TAM up from real customer counts and pricing... Qubit Capital Article · Starting Up Bottom-Up Market Sizing for Startups Qubit Capital In 4 answers
24. The hype cycle names the exact trap in your question: the peak of inflated expectations, the trough of disillusionment, then... Gartner Article · 10 min read · Starting Up Gartner Hype Cycle Research Methodology Gartner In 4 answers

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