Explore · The library

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. Video · How Founders Use AI Everything Gets Rebuilt: The New AI Agent Stack Harrison Chase (LangChain)
  2. Video · How Founders Use AI How Perplexity works | Aravind Srinivas and Lex Fridman Lex Fridman
  3. Video · How Founders Use AI Can Perplexity beat Google? | Aravind Srinivas and Lex Fridman Lex Fridman
  4. Video · How Founders Use AI Perplexity CEO explains RAG: Retrieval-Augmented Generation Lex Fridman
  5. Video · How Founders Use AI Nikhil Kamath ft. Perplexity CEO Aravind Srinivas | WTF Online Ep 1 Nikhil Kamath (WTF)
  6. Video · How Founders Use AI How To Use Perplexity AI For Research - Terrifyingly SMART! AI educator (YouTube)
  7. Video · How Founders Use AI How to Use Perplexity AI 2025 (Step by Step Tutorial for Beginners) YouTube tutorial
  8. OpenAI's own India-focused session on replacing search with ChatGPT's research stack. academy.openai.com Video · How Founders Use AI ChatGPT for Research: Web Search, Deep Research & Code (OpenAI Academy India) OpenAI Academy India
  9. Video · How Founders Use AI Introduction to Deep Research (launch demo from Tokyo) OpenAI
  10. Video · How Founders Use AI OpenAI's Deep Research Agent in 8 Minutes YouTube explainer
  11. Video · How Founders Use AI No Priors Ep. 112: OpenAI Deep Research with Isa Fulford No Priors (Sarah Guo, Elad Gil)
  12. Video · How Founders Use AI Deep Research Battle: Gemini beats ChatGPT, Perplexity & Grok YouTube AI reviewer
  13. Video · How Founders Use AI Why Large Language Models Hallucinate Martin Keen, IBM Technology
  14. Video · How Founders Use AI OpenAI Explains: Why Language Models Hallucinate & How to Reduce Them YouTube AI explainer
  15. Video · How Founders Use AI How to Fact-Check ChatGPT and Other AI Tools YouTube tutorial
  16. Video · How Founders Use AI ChatGPT, Claude, Gemini, Grok, Perplexity: Which One Is Actually Worth It? Tristan Ahumada
  17. Prompting techniques specifically aimed at getting fewer made-up answers. mediacenter.ibm.com Video · How Founders Use AI Tuning Your AI Model to Reduce Hallucinations IBM
  18. Video · How Founders Use AI How to Do a Market Research With AI YouTube tutorial
  19. Video · How Founders Use AI The State of AI in Market Research and Insights in 2025 Ray Poynter (NewMR) & Yasna.ai
  20. Video · How Founders Use AI How to Use AI for Market Research and Content Planning YouTube tutorial
  21. Video · How Founders Use AI The Easiest Way to Validate Your Startup Idea in 2025 YouTube startup channel
  22. Video · How Founders Use AI How I Spy on Competitors (Legally) Using AI YouTube operator
  23. Video · How Founders Use AI This Tool Shows You How To Spy on Your Competitors in AI Search Semrush
  24. Video · How Founders Use AI Teresa Torres on continuous discovery in B2B, AI prototypes, and synthetic personas Teresa Torres interview

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The hubs

Starting Up Find an idea, validate it, build, and land your first customers. 1327 questions GTM Go-to-market, from breaking in to how the best teams do it. 379 questions D2C Building a direct-to-consumer brand, India-first. 512 questions Wealth Paying yourself, ESOPs, secondaries, and de-risking founder wealth. 165 questions How Founders Use AI How founders actually put AI to work, mapped topic by topic. 360 questions Glossary Plain-language definitions of the startup and VC terms you'll hit. 425 terms
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