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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. A top consumer investor answers the exact question, drawn from hundreds of a16z Speedrun applications. x.com Thread · How Founders Use AI "Does my new startup idea need to have AI in it?" Andrew Chen (a16z)
  2. A data company's candid recap of which of its own AI features users adopted and why. amplitude.com Article · How Founders Use AI What We Learned Building AI Products in 2025 Amplitude
  3. A case study of an incumbent rebuilding around one AI feature that customers demonstrably pay for. bvp.com Article · How Founders Use AI How Intercom navigated the AI paradigm shift Bessemer Venture Partners
  4. The sharpest counterargument you will read; know the backlash before you ship an unwanted AI feature. honest-broker.com Article · How Founders Use AI The Force-Feeding of AI on an Unwilling Public Ted Gioia (The Honest Broker)
  5. A respected discovery coach documents what surprised her when she actually built an AI product herself. producttalk.org Article · How Founders Use AI Building My First AI Product: 6 Lessons from My 90-Day Deep Dive Teresa Torres (Product Talk)
  6. Video · How Founders Use AI Deep Dive into LLMs like ChatGPT Andrej Karpathy
  7. Video · How Founders Use AI RAG Explained For Beginners KodeKloud
  8. Video · How Founders Use AI Build and Deploy a RAG Chatbot with JavaScript, LangChain.js, Next.js freeCodeCamp (Ania Kubow)
  9. Free, thorough, and taught by the engineer who wrote much of LangChain's RAG tooling. freecodecamp.org Course · How Founders Use AI Learn RAG from Scratch (Python tutorial from a LangChain engineer) freeCodeCamp (Lance Martin, LangChain)
  10. The follow-on course for when your prototype RAG needs to survive real users. freecodecamp.org Course · How Founders Use AI Production RAG with LangChain and Vector Databases freeCodeCamp
  11. The primary source for letting the model trigger your app's actions, the step from chatbot to feature. developers.openai.com Guide · How Founders Use AI Function calling (OpenAI API docs) OpenAI
  12. Guaranteed-JSON responses ended a whole class of parsing bugs; read this before writing a parser. openai.com Article · How Founders Use AI Introducing Structured Outputs in the API OpenAI
  13. The most popular TypeScript toolkit for streaming AI features, with 25+ providers behind one API. github.com Tool · How Founders Use AI Vercel AI SDK Vercel
  14. Free structured course covering prompting, extraction, streaming, and tool calls in real product code. vercel.com Course · How Founders Use AI Builders Guide to the AI SDK Vercel Academy
  15. A production-ready open-source chatbot with auth and persistence; fork it instead of starting from zero. github.com Tool · How Founders Use AI Vercel AI Chatbot template Vercel
  16. Six practitioners condense a year of production LLM scar tissue into tactical advice. oreilly.com Article · How Founders Use AI What We Learned from a Year of Building with LLMs (Part I) Eugene Yan, Hamel Husain, Jason Liu, Shreya Shankar, et al.
  17. The whole LLM-product stack in one thread; a map of every decision you will eventually face. x.com Thread · How Founders Use AI Patterns for LLM systems: evals, RAG, fine-tuning, caching, guardrails Eugene Yan (Anthropic)
  18. The most-read O'Reilly book of 2025; the reference text once you outgrow tutorials. oreilly.com Guide · How Founders Use AI AI Engineering: Building Applications with Foundation Models Chip Huyen
  19. An India-based walkthrough from API key to working app, aimed at non-ML developers. analyticsvidhya.com Guide · How Founders Use AI Build Your First LLM Application: A Beginner's Tutorial Analytics Vidhya
  20. The gentlest possible on-ramp if your team writes Python but has never called a model API. machinelearningmastery.com Guide · How Founders Use AI Your First OpenAI API Project in Python, Step-By-Step Machine Learning Mastery
  21. A CPO livebuilds a real feature with AI tools, showing how fast the idea-to-ship loop has become. creatoreconomy.so Article · How Founders Use AI From Idea to Product in 30 Min Using AI Agents | Claire Vo Peter Yang (Creator Economy) with Claire Vo
  22. The default podcast of people who ship AI features for a living; subscribe and skim show notes. latent.space Podcast · How Founders Use AI Latent Space: The AI Engineer Podcast swyx and Alessio Fanelli
  23. Cached reads cost 10% of normal input price; the single highest-leverage cost lever, from the primary source. platform.claude.com Guide · How Founders Use AI Prompt caching (Claude docs) Anthropic
  24. A flat 50% discount for anything that can wait up to 24 hours, like digests, enrichment, and backfills. developers.openai.com Guide · How Founders Use AI Batch API (OpenAI docs) OpenAI

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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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