✍️ Essay
✓ Link checked
Free
Beginner
Why we picked it
The definitive essay on where good ideas come from: notice problems you personally have, don't force it. Use it as the lens for judging whether your idea is a real problem or a solution in search of one.
From
paulgraham.com
by Paul Graham
~20 min read
- Live in the future and build what's missing.
- The best ideas look like bad ideas at first (schleps and hard-to-explain).
- Start with problems you have, in a domain you actually know.
Open
paulgraham.com →
📖 Book
✓ Link checked
Paid
Beginner
Why we picked it
The single best thing ever written on customer conversations. It teaches you to ask about the customer's life and past behaviour, not your idea, so you can't be lied to. If a founder reads one thing before talking to a single customer, it's this.
From
momtestbook.com
by Rob Fitzpatrick
~130 pages
- Talk about their life, not your idea.
- Ask about specifics in the past, not opinions about the future.
- 'That's so cool, I'd totally buy it' is a compliment, not data, dig for commitment and evidence.
Open
momtestbook.com →
📖 Book
✓ Link checked
Paid
Intermediate
Why we picked it
Dunford's whole method starts with the customers who already love your product, then turns that into positioning the entire team can repeat the same way. Her final step is literally capturing positioning so it can be shared, which is the exact problem you have once new hires start describing your customer in their own words. Read it when you want the ICP and the pitch to stay consistent from the founder down to the newest rep.
From
April Dunford
by April Dunford
Short book, about 200 pages
- Positioning should start from the specific customers who already get real value, not from a generic market.
- A shared positioning document is what keeps a growing team describing the same ideal customer.
- The book is battle tested across hundreds of B2B tech companies, so the process travels well beyond one industry.
Open
aprildunford.com →
📄 Article
✓ Link checked
Freemium
Beginner
Why we picked it
Todd Jackson studied how dozens of now-large companies validated their very first idea. The pattern that repeats: deliver the outcome by hand, talk to real users, and watch for genuine emotion. A polite 'that's cool' is a no. Strong reactions are the signal you want.
From
Lenny's Newsletter
by Todd Jackson
~15 min read
- Manual delivery beats a survey for early signal.
- Look for strong emotion, not politeness.
- Great ideas usually start from a problem you have lived.
Open
lennysnewsletter.com →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
A practical checklist for turning a hunch into tested evidence, including how to run interviews that surface pain before you mention your product. It keeps you honest about whether the narrow group you are targeting actually wants a switch. Use it as a step by step starting point for your first round of validation.
From
First Round Review
by First Round Review
~15 min read
- Let users describe their pain before you introduce your solution
- Pick a market big enough to matter even after you narrow in
- Validation is an ongoing habit, not a one time gate
Open
review.firstround.com →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
This lays out a cheap, staged way to test whether an idea has real pull before you build anything, which maps directly onto validating both sides of a marketplace by hand. It gives you gates to pass rather than a vague sense of momentum. Use it to decide whether your ten manual matches actually justify writing code.
From
First Round Review
by Gagan Biyani
~20 min read
- Run the cheapest test that could kill the idea first
- Define what a pass and a fail actually look like before you start
- Real commitment beats stated interest as a signal
Open
review.firstround.com →
📄 Article
✓ Link checked
Free
Intermediate
Why we picked it
Turns the vague feeling of product-market fit into a number you can move. Ask users how they would feel if they could no longer use the product, then track the share who say 'very disappointed'. Under 40 percent means keep working. A test you can run on an idea long before you scale it.
From
First Round Review
by Rahul Vohra
~20 min read
- The 40 percent 'very disappointed' benchmark for product-market fit.
- Segment to your high-expectation customers and build for them.
- Make the fit score a metric you improve quarter by quarter.
Open
review.firstround.com →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
The primary-source telling of the milkshake story, the single most memorable illustration of Jobs to Be Done, straight from Christensen and HBS. The best on-ramp to JTBD.
From
HBS Working Knowledge
by Clayton Christensen (via Harvard Business School)
~8 min read
- Customers 'hire' products to do a job in a specific situation
- The milkshake was hired to make a boring commute bearable, not just for taste
- Understand the job, and the right product improvements become obvious
- Demographics miss the point, situation and job drive purchases
Open
library.hbs.edu →
📖 Book
✓ Link checked
Paid
Intermediate
Why we picked it
When incumbents all compete on the same features for the same buyers, this book shows how to redraw the offer so you are not fighting on their terms. It gives you tools to drop what the leader overserves and add what a neglected segment actually values. Use it to design a wedge that sidesteps a head on price and feature war.
From
W. Chan Kim and Renee Mauborgne
by W. Chan Kim and Renee Mauborgne
~250 pages
- Compete by changing what you offer, not by matching rivals
- Drop features the incumbent overserves, add what buyers really want
- New demand often sits in the space the leaders overlook
Open
blueoceanstrategy.com →
📖 Book
✓ Link checked
Paid
Beginner
Why we picked it
Savoia, who led early Google AdWords, argues most ideas fail because nobody wanted them, and teaches pretotyping: cheap experiments that generate your own data on real demand before you build. You get concrete tactics like the fake-door and the mechanical-turk test, plus a way to demand skin-in-the-game commitment rather than opinions. Practical for anyone who wants a test that can prove them wrong.
From
Alberto Savoia
by Alberto Savoia
~250 pages
- Collect your own data on real behaviour instead of trusting opinions
- Pretotype the idea to test demand before you build a prototype
- Measure commitments like a signup or a payment, not verbal enthusiasm
Open
albertosavoia.com →
✍️ Essay
✓ Link checked
Free
Intermediate
Why we picked it
The essay that put 'product-market fit' into the startup vocabulary. Read it for the gut-level description of what PMF feels like when it's happening vs when it isn't, the intuition behind the metrics.
From
pmarchive.com
by Marc Andreessen
~15 min read
- Market matters most; a great market pulls product out of a startup.
- You can feel PMF, customers buy as fast as you can ship.
- Before PMF, do whatever it takes to get there; nothing else counts.
Open
pmarchive.com →
📄 Article
✓ Link checked
India
Free
Intermediate
Why we picked it
Shah argues that to make people switch from what they already use, you need a large jump in perceived efficiency, not a marginal one. In a crowded market that is the bar for your wedge: the incumbent may be good enough for most, so your narrow segment has to feel a dramatic gain. Read it to sanity check whether your improvement is big enough to change behavior.
From
SeedToScale (Accel India)
by Kunal Shah
~10 min read
- People only switch when the efficiency jump is large, not marginal
- Look for inefficiencies incumbents leave in place, not just problems
- A big enough delta makes the new behavior stick and spread
Open
seedtoscale.com →
📄 Article
✓ Link checked
Freemium
Intermediate
Why we picked it
If you are selling to companies rather than consumers, this is the specific playbook. Four concrete ways founders got signal before building, from doing the job by hand for one customer to interviewing dozens of potential users first.
From
Lenny's Newsletter
by Lenny Rachitsky
~12 min read
- Do the job by hand for one real customer before automating.
- Interview a wide set of potential users before committing.
- B2B signal looks different from consumer signal.
Open
lennysnewsletter.com →
