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 24 Hours Inside a YC AI Startup (Outset) Y Combinator
  2. Video · How Founders Use AI A NotebookLM Deep Dive Jeff Su
  3. Video · How Founders Use AI The Ultimate Guide to NotebookLM: All 2025 Features Explained YouTube tutorial
  4. Video · How Founders Use AI How to Use Google NotebookLM (Step-by-Step Guide) YouTube tutorial
  5. Video · How Founders Use AI Perplexity AI Labs Tutorial & Review YouTube tutorial
  6. Video · How Founders Use AI How To Test ANY Startup Idea In 24 Hours (No Code + AI) YouTube creator (startup tutorials)
  7. Video · How Founders Use AI How to Validate Your AI Startup Idea FAST (Step-by-Step) YouTube creator (AI startups)
  8. Video · How Founders Use AI How to Validate your Startup Idea With One AI Prompt (Beginner Friendly Guide) YouTube creator (indie hacking)
  9. Video · How Founders Use AI how to validate startup ideas in 24 hours w/o code YouTube creator (no-code)
  10. Video · How Founders Use AI Rapidly test and validate any startup idea with the 2-day Foundation Sprint Jake Knapp & John Zeratsky
  11. Video · How Founders Use AI How to Validate Your Startup Idea for $50 (Same Method That Built a $100M Brand) YouTube creator (DTC founder)
  12. Video · How Founders Use AI How to Validate Your Startup Idea Using AI Tools YouTube creator (startup tools)
  13. Video · How Founders Use AI How to use AI to do quick competitive analysis YouTube creator (product marketing)
  14. Video · How Founders Use AI How to use AI for Competitor Analysis in Product Marketing (in 5 mins) YouTube creator (product marketing)
  15. Video · How Founders Use AI Create a McKinsey-Level Competitive Analysis with AI! YouTube creator (AI for business)
  16. Video · How Founders Use AI Build an AI Competitor Analysis Agent (No-Code Tutorial) YouTube creator (automation)
  17. Video · How Founders Use AI Build an AI Competitor Analysis Tool with Lovable AI & Firecrawl | Full Tutorial YouTube creator (dev tutorials)
  18. Video · How Founders Use AI AI Competitors Analysis: The Only AI Workflow I Trust YouTube creator (marketing ops)
  19. Video · How Founders Use AI Miro Flows Tutorial: Automate Competitor Analysis with AI Miro
  20. Video · How Founders Use AI The RIGHT Way to Calculate your Market Size (TAM/SAM/SOM) YouTube creator (startup finance)
  21. Video · How Founders Use AI How to Size Your Market (TAM SAM SOM) the RIGHT WAY YouTube creator (startup funding)
  22. Video · How Founders Use AI Why Everyone Gets TAM Market Sizing WRONG: Explained by a VC VC (YouTube)
  23. Video · How Founders Use AI How to Size Your Addressable Market (TAM, SAM, SOM, top-down vs. bottom-up) YouTube creator (startup education)
  24. Video · How Founders Use AI How To Size Your Market (TAM, SAM, SOM Explained Simply) YouTube creator (startup education)

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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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