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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. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. The compressed takeaways thread; a 2-minute read to align your team. x.com Thread · How Founders Use AI AEO is the biggest change in search in a decade Lenny Rachitsky In 2 answers
  19. The most data-driven annual read on what actually moves AI visibility. growth-memo.com Article · How Founders Use AI State of AI Search Optimization 2026 Kevin Indig In 2 answers
  20. One post consolidating a year of AI-search research findings. growth-memo.com Article · How Founders Use AI 2026 Growth Memo research summary Kevin Indig In 2 answers
  21. Comet went free globally, making it the cheapest way to try agentic browsing. perplexity.ai Article · How Founders Use AI The Internet is Better on Comet (free worldwide) Perplexity In 2 answers
  22. The constructive half: the channels that still compound when search clicks die. sparktoro.com Article · How Founders Use AI When Google Stops Sending Clicks, What Still Works? Rand Fishkin, SparkToro In 2 answers
  23. The policy change (5-year retention if you opt in to training) every Claude user should know. anthropic.com Article · How Founders Use AI Updates to Consumer Terms and Privacy Policy Anthropic In 2 answers
  24. A legal read of the updated Claude terms for anyone handling client data. amstlegal.com Article · How Founders Use AI Anthropic's Claude AI Updates: Impact on Privacy & Confidentiality AMST Legal 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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