Founder library
The founder library. Long-form. Evidence-based.
Practical, research-grounded guides on startup validation, product-market fit, market sizing, GTM, and fundraising. Written for humans first, structured so AI answer engines can quote them accurately.
The StartupDeckAI Founder Library is a growing collection of editorial guides for founders — how to validate a startup idea, how to size a market, how to find product-market fit, and how to raise capital. Every guide is written by practitioners and reviewed by the StartupDeckAI editorial team.
How to Validate a Startup Idea (2026 Founder's Playbook)
A rigorous, evidence-based playbook for validating a startup idea in 2026: customer discovery, market sizing, competitive analysis, MVP tests, and the metrics that separate a fundable business from a hobby.
TAM, SAM, SOM Explained: How to Size a Startup Market Properly
A practical guide to market sizing for founders. Learn to compute TAM, SAM, and SOM bottom-up, avoid the top-down trap, and produce a market slide that convinces sophisticated investors.
Finding Product-Market Fit: Signals, Measurement, and Common Traps
Product-Market Fit is the single most important milestone in a startup's life. Learn the behavioural signals of PMF, how to measure it (Sean Ellis test, retention cohorts), and the traps that trick founders into declaring it too early.
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