Every resource founders actually use, in one library.

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

1. Video · Starting Up How to Use PostHog: Step-by-Step Guide for Product Analytics & Session Replay PostHog In 2 answers
2. Video · About 30 minutes · Starting Up How to Get Users and Grow Gustaf Alstromer In 2 answers
3. Video · ~15 min · Starting Up How to CRUSH Facebook Ads with a Small Budget in 2026 Ben Heath In 2 answers
4. Video · Starting Up How I use AI to save 10+ hours per week Ali Abdaal In 2 answers
5. Video · about 1 hour · Starting Up Mastering onboarding | Lauryn Isford (Head of Growth at Airtable) Lenny Rachitsky and Lauryn Isford In 2 answers
6. YC's David Lieb walks through cohort retention: watching each week's new users and asking how many actually come back. For a... Y Combinator Startup School Video · ~20 min · Starting Up How To Improve Cohort Retention David Lieb In 2 answers
7. Video · about 22 minutes · Starting Up Consumer Startup Metrics | Startup School Tom Blomfield In 2 answers
8. Video · About 5 minutes · Starting Up Contribution Margin explained Philip de Vroe (The Finance Storyteller) In 2 answers
9. Video · About 6 minutes · Starting Up How to calculate burn rate, runway, and growth rate Tim Brady In 2 answers
10. Video · Short explainer video, a few minutes · Starting Up Cash Flow vs. Profit: What's the Difference? HBS Online In 2 answers
11. Video · webinar-length walkthrough · Starting Up Mastering Financial Models for Your Startup with Logan Burchett Logan Burchett (Co-founder, Forecastr) In 2 answers
12. YC is openly skeptical of a remote co-founder (they discount the plan if a linchpin is distant), which makes this the most... Y Combinator Video · 35 min · Starting Up Best Practices for Managing a Remote Team Y Combinator In 2 answers
13. Segment's founder walks through failures and near-misses so you can feel the contrast between not having fit and having it.... Y Combinator (Startup Library) Video · ~45 min · Starting Up How to Start a Startup: Finding Product-Market Fit Peter Reinhardt (Segment) In 2 answers
14. Caldwell has watched thousands of YC companies pivot, and he lays out what a good pivot looks like versus flailing. His key... Y Combinator Startup Library (Dalton Caldwell) Video · ~15 min · Starting Up All about pivoting Dalton Caldwell In 2 answers
15. Video · ~35 min · Starting Up Growth for Startups Gustaf Alstromer In 2 answers
16. Video · 50 min · Starting Up Stanley Tang (DoorDash): Scaling the Unscalable Stanley Tang In 2 answers
17. A short clip of Paul Graham explaining the idea in his own words, useful if you want the core of the essay before committing to... Startup Archive Video · 5 min · Starting Up Paul Graham explains what it means to do things that don't scale Paul Graham In 2 answers
18. Video · ~20 min · Starting Up Solving the Chicken or Egg Problem James Currier In 2 answers
19. Video · ~45 min · Starting Up Building Product, Talking to Users, and Growing (How to Start a Startup, Lecture 4) Adora Cheung In 2 answers
20. Video · 5 min · Starting Up Debt Metaphor Ward Cunningham In 2 answers
21. Video · 15 min video · Starting Up Build a Simple App from a Google Sheet with Glide Glide In 2 answers
22. Video · Starting Up Andrej Karpathy: From Vibe Coding to Agentic Engineering Andrej Karpathy In 2 answers
23. Taggar covers the full arc: why a co-founder matters, when to bring one on, where to look, and how to keep the relationship... Y Combinator Startup Library Video · Starting Up How To Find A Co-Founder Harj Taggar In 2 answers
24. Video · 50 min · Starting Up How to Start a Startup, Lecture 2: Team and Execution Sam Altman In 2 answers

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