📖 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 →
✍️ 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 →
📖 Book
✓ Link checked
Freemium
Intermediate
Why we picked it
The authoritative handbook on founder-led sales, written for technical/first-time sellers building B2B SaaS. Readable free online via membership, and covers the whole motion end to end.
From
foundingsales.com
by Peter Kazanjy
book (~400 pages)
- Do ~50 demos and hit a ~20%+ win rate before hiring your first sales rep.
- Discovery before demo, understand the problem before you pitch.
- Dedicated chapters on prospect outreach and demo appointment setting.
- Turn founder selling into a documented, repeatable, transferable process.
Open
foundingsales.com →
📄 Article
✓ Link checked
Freemium
Intermediate
Why we picked it
A tactical follow-on covering the channels and motions top B2B startups scale after the first ten. Grounds distribution strategy in real company examples.
From
Lenny's Newsletter
by Lenny Rachitsky
~15 min read
- Content/SEO is a surprisingly dominant B2B channel (Vanta, Amplitude, Figma, HubSpot).
- The core B2B channels: self-serve inbound, sales-assist inbound, outbound, content, paid, partnerships.
- Pick and systematize the one channel that compounds for you.
- Distribution strategy should follow evidence, not fashion.
Open
lennysnewsletter.com →
📄 Article
✓ Link checked
Free
Intermediate
Why we picked it
When your first ten will come from cold outreach, this guide gives you the full mechanics: building a target list, qualifying, writing the email, and running follow-ups without being annoying. It is the operational counterpart to the Lenny and YC pieces, showing the actual day-to-day of prospecting. Work through it as a checklist for your outbound.
From
Close
by Steli Efti
Multi-chapter guide
- Build a tight, specific list of the right people before you write anything.
- Qualify hard so you spend time on prospects who can actually buy.
- Structured follow-up, not a single email, is where most deals are won.
Open
close.com →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
The idea that started the lean movement, from the person who coined it. No business plan survives first contact with customers, so stop defending assumptions at your desk and go test them on real people. Short, blunt, and foundational.
From
steveblank.com
by Steve Blank
~8 min read
- Your idea is a set of guesses until customers test it.
- Facts live outside the building, not in your plan.
- Expect to be wrong, and plan to learn from it.
Open
steveblank.com →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
The most-quoted primary source on why founders should launch fast and iterate, short, canonical, and from the co-founder of YC. Read it when you're tempted to keep polishing before launch.
From
paulgraham.com
by Paul Graham
~8 min read
- Launch fast, you haven't really started until you launch.
- Most ideas appear in the implementing, so ship to learn.
- Make a few users love you rather than many ambivalent.
Open
paulgraham.com →
📄 Article
✓ Link checked
Free
Intermediate
Why we picked it
Blomfield (founder of Monzo and GoCarchless, now a YC partner) gives the concrete mechanics of closing that first B2B deal: pick one wedge product and sell it hard for a couple of weeks, run paid pilots not vague free design partnerships, and use opt-out contracts to convert. It is the tactical how-to for turning your one target customer into a signed, paying pilot while you are still employed.
From
Y Combinator Startup Library
by Tom Blomfield
25 min read
- Charge for the pilot: a paid pilot with clear success criteria is real proof; a long, undefined free design partnership is the most common founder mistake and proves nothing
- Pick a narrow wedge and sell it aggressively for two weeks; if it does not land, switch the wedge rather than piling on features
- Find and cultivate an internal champion who sells for you when you are not in the room, which is how a single evening-and-weekend deal actually closes inside a company
Open
ycombinator.com →
📄 Article
✓ Link checked
Free
Beginner
Why we picked it
Lemkin's blunt answer is that the founder has to get the first 10 customers personally, through their own network and direct outreach, before anyone else can be hired to help. It's a short, direct piece that removes any excuse to delegate the selling before you've done it yourself.
From
Jason Lemkin (SaaStr)
- The founder is the best salesperson for the product in the earliest days, customers want to talk to the person who built it
- Only hire a salesperson after you've closed the first 10 customers yourself and can show them how
- If sales is taking more than a fifth of your week and working, that's a sign to keep leaning in, not to back off
Open
saastr.com →
📖 Book
✓ Link checked
Paid
Beginner
Why we picked it
The origin text for the modern MVP and validated-learning vocabulary every founder now uses. Read it for the mental model that a startup is a series of experiments, not a single bet.
From
theleanstartup.com
by Eric Ries
~330 pages
- Progress = validated learning, not features shipped.
- Run the Build-Measure-Learn loop as fast as you can.
- An MVP is a learning tool, not a cheap product.
Open
theleanstartup.com →
Why we picked it
The permission slip to recruit users by hand, do things manually, and deliver 'insanely great' experiences to your first few customers. The cheapest, most honest way to validate demand is to go get it one person at a time.
From
paulgraham.com
by Paul Graham
~15 min read
- Recruit your first users manually, don't wait for them to come.
- A tiny group of users who love you beats a big group who like you.
- Manual, unscalable effort early is a feature, not a failure.
Open
paulgraham.com →
Why we picked it
The essay that explains why one badly-placed meeting can destroy a founder's entire day of building, and what to do about it. Essential mental model for anyone who both makes and manages.
From
paulgraham.com
by Paul Graham
short
- Makers need time in half-day units; managers slice time into one-hour appointments
- A single meeting can wreck a maker's whole afternoon by fragmenting the block
- Batch meetings into designated windows to protect long stretches of deep work
- Founders who both build and manage must consciously switch between the two modes
Open
paulgraham.com →
Why we picked it
A short, practical field guide to customer discovery: who to talk to, how to find them, and how many. Pairs perfectly with The Mom Test, Fitzpatrick teaches the questions, Constable teaches the logistics.
From
talkingtohumans.com
by Giff Constable
~80 pages (free PDF available)
- Decide who you need to learn from before you start.
- Recruiting interviewees is a skill, scripts and channels included.
- Get out of the building; patterns emerge faster than you expect.
Open
talkingtohumans.com →
