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Every resource founders actually use, in one library.

The essays, videos, podcasts, books and tools behind every answer across eChai's hubs, from starting up to go-to-market, D2C, founder money and AI, each with a note on why it is here.

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

  1. The business-impact view of the Cursor incident, including the labelling fix that followed. fortune.com Article · How Founders Use AI A customer support AI went rogue, and it's a warning for every company Fortune In 2 answers
  2. A neutral incident record, and a database worth browsing before you ship anything customer-facing. incidentdatabase.ai Article · How Founders Use AI AI Incident Database: Cursor support bot invents login policy AI Incident Database In 2 answers
  3. Nine hands-on chapters that take you from novice to competent prompter in a weekend. github.com Course · How Founders Use AI Anthropic's Interactive Prompt Engineering Tutorial Anthropic In 2 answers
  4. Notion rebuilt its agent architecture five times; hear what finally worked at 100M-user scale. latent.space Podcast · How Founders Use AI Notion's Token Town: 5 Rebuilds, 100+ Tools Latent Space with Simon Last and Sarah Sachs (Notion) In 2 answers
  5. The primary source: API data is not used for training by default, with retention controls explained. openai.com Guide · How Founders Use AI Enterprise privacy at OpenAI OpenAI In 2 answers
  6. Anthropic's equivalent answer, including the commercial-products carve-out. privacy.claude.com Guide · How Founders Use AI Is my data used for model training? (Anthropic Privacy Center) Anthropic In 2 answers
  7. A startup-sized DPDP compliance checklist from an Indian privacy consultancy. tsaaro.com Article · How Founders Use AI Compliance Blueprint for AI Startups and SMEs: DPDPA 2023 and DPDP Rules 2025 Tsaaro Consulting (India) In 2 answers
  8. Poyar talks through the reasoning behind the data, listenable on a commute. schematichq.com Podcast · How Founders Use AI Kyle Poyar: The State of AI Pricing (Monetizing AI) Schematic (Monetizing AI) In 2 answers
  9. Video · How Founders Use AI Aravind Srinivas: Perplexity CEO on Future of AI, Search & the Internet (Lex Fridman #434) Lex Fridman In 2 answers
  10. A trusted institutional primer on why hallucinations happen and practical mitigations. mitsloanedtech.mit.edu Guide · How Founders Use AI When AI Gets It Wrong: Addressing AI Hallucinations and Bias MIT Sloan Teaching & Learning Technologies In 2 answers
  11. Six concrete habits, including deliberately asking the model for contradicting evidence. forbes.com Article · How Founders Use AI 6 Proven Ways To Fact Check AI Accuracy And Verify Answers Forbes Technology Council In 2 answers
  12. A rigorous reference with famous real-world examples to share with your team. ibm.com Guide · How Founders Use AI What Are AI Hallucinations? IBM In 2 answers
  13. Covers Grok's DeepSearch angle, live X data, that other comparisons skip. gradually.ai Article · How Founders Use AI Deep Research: Grok 3 vs. ChatGPT vs. Perplexity vs. Gemini Gradually AI In 2 answers
  14. The most-cited 'which model for which job' cheat sheet, updated as models change. oneusefulthing.org Guide · How Founders Use AI Using AI Right Now: A Quick Guide Ethan Mollick In 2 answers
  15. Before picking a tool, decide whether the task should go to AI at all. oneusefulthing.org Article · How Founders Use AI 15 Times to use AI, and 5 Not to Ethan Mollick In 2 answers
  16. Updated best practices that transfer well to every frontier model, not just Claude. platform.claude.com Guide · How Founders Use AI Claude prompting best practices Anthropic In 2 answers
  17. A respected SaaS operator's real workflows for market and GTM research with deep research. growthunhinged.com Article · How Founders Use AI How to use Deep Research for GTM Kyle Poyar, Growth Unhinged In 2 answers
  18. An honest experiment exposing where AI validation helps and where it flatters you. ideadose.dev Article · How Founders Use AI Can ChatGPT Validate Your Startup Idea? We Tested 3 Ideas to Find Out IdeaDose In 2 answers
  19. A ruthless 30-minute kill-or-continue protocol you can run tonight. ai.plainenglish.io Article · How Founders Use AI The 30-Minute Startup Test: How I Use ChatGPT to Validate (or Kill) Any Business Idea Ashok Reddy In 2 answers
  20. A broad prompt bank covering TAM/SAM/SOM, personas and pricing research. juma.ai Guide · How Founders Use AI 28 ChatGPT Prompts For Market Research That Work Juma AI In 2 answers
  21. Step-by-step Gemini workflow, plus how it compares to ChatGPT and Claude for CI. mindstudio.ai Guide · How Founders Use AI How to Use Gemini Deep Research for Competitive Intelligence and Market Reports MindStudio In 2 answers
  22. Video · How Founders Use AI Competitive Analysis for Startups: AI Tools & Competitor Quadrants YouTube startup channel In 2 answers
  23. Run 50 problem interviews in a weekend; the leading AI-moderated interview tool. outset.ai Tool · How Founders Use AI Outset: AI-moderated research platform Outset In 2 answers
  24. The most ambitious version of customer-conversation mining you can steal ideas from. lennysnewsletter.com Article · How Founders Use AI How I AI: CEO turned 25,000 hours of sales calls into a self-learning GTM engine Lenny's Newsletter (How I AI) In 2 answers

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The hubs

Starting Up Find an idea, validate it, build, and land your first customers. 1046 questions GTM Go-to-market, from breaking in to how the best teams do it. 352 questions D2C Building a direct-to-consumer brand, India-first. 482 questions Wealth Paying yourself, ESOPs, secondaries, and de-risking founder wealth. 154 questions How Founders Use AI How founders actually put AI to work, mapped topic by topic. 278 questions Glossary Plain-language definitions of the startup and VC terms you'll hit. 390 terms
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