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Ask people who've lived it
Ask a quick question
My ex undermines every rule I set and calls it co-parenting
I make $32k a year and I'm $9k in credit card debt with nothing left over
I replay the same conversation in my head for hours after it's over
My team is betting the whole roadmap on AI and I think it's hype
Should we redesign the experience or fix the rough parts one at a time?
My instagram following has been stuck at 800 for two years and I don't know what moves the needle
Ask the experts
Lorraine on getting noticed for your work“Doing great work doesn’t guarantee recognition. Make your impact easy to explain so people can advocate for you when you’re not in the room.”
Guillermo on building Vercel and Next.js“The best things we've done for our brand is the things that we did without thinking we're working on our brand.”
Codie on buying businesses and building wealth“You don’t need a revolutionary idea to build wealth. You need a business people already pay for, and the skills to run it better.”
Jeffrey on why treating symptoms is the wrong place to start“Symptoms are late signals, not first causes. In chronic illness the biology starts drifting years before a diagnosis. If you start at the symptom, you are downstream. You may mute the alarm without finding the fire. The body is a network, so ask what shifted in the person's story and physiology that made the symptom possible, then address that.”
Spencer on life inside an NBA organization“I used to think pushing past your body meant toughness, but the league taught me that the hardest skill is staying on the floor.”
Matthew on finding the right partner“You want to be happy enough that the right thing doesn’t become your everything.”
Nyree on why you crash at 2 p.m. after a full night's sleep“Eight hours in bed means nothing if your brain never entered deep restorative sleep, and by 2 p.m. your adenosine tank is still full from incomplete overnight clearance.”
Kirsten on how AI changes what consumers buyTime 100 Most Influential People and dollar Shave Club sold for $1B.
Soleio on designing products people love“Good design starts with knowing what matters. If your team can’t agree on the problem, polishing the interface won’t fix it.”
Suzanne on what happens behind closed doors in a layoff“I've personally been involved in laying off well over a thousand people, and the part no one talks about is how fast the dignity gets stripped away: one minute you're trusted, the next a manager you've never met is reading you a script while someone cuts your computer access.”
Guillermo on building Vercel and Next.js“I want people to write these verification loops because it's gonna give me conviction in the product that it'll deliver to my customer.”
Deena on raising venture money as an underestimated founder“Do your homework on who you're pitching. Most founders spray and pray, but that wastes everyone's time. And bring your full self to the conversation. The intersectional, the immigrant, the nontraditional founder, those backgrounds are not weaknesses. They're edges. The data shows diverse founding teams build better businesses. But you have to own it.”
Céline on protecting your health in a noisy information world“I protect my health the same way I protect my patients: by curating my information diet the way I curate my food. I go to the source, I follow people who've been right before and correct themselves when the evidence changes, and I stay open to changing my mind. Certainty that cannot bend is not strength; it is a vulnerability.”
Moses on making it to the top when you started with nothing“I had love for the game, parents who kept me grounded, and a city that taught me how to compete. What kept me going was consistency and curiosity. You control what you can control, stack good days, and let the game reward you when it's time.”
Vanessa on sexual expectations couples never say out loud“I don't believe in a universal normal for any stage, but I do think it's completely natural for that early honeymoon frequency to taper off after about a year.”
Julian on using a system to curb phone distractions“I don't try to restart at full speed; I drop back to the mínimo viable version of each habit until the momentum returns, because a 20-minute workout and one focused block on the side project beats another day of zero.”
Andrej on how far we are from AGILed Tesla Autopilot computer vision team and founding member of OpenAI.
Brian on scaling a company“The leadership style that gets you to ten employees won’t get you to a thousand. Your company can’t evolve unless you do.”
Lenny on breaking into product management“A few paths actually work. The safest is transitioning internally, partnering closely with a PM until you can make the case. The second is joining an early-stage startup where everyone does everything. Regardless of path, become the person who deeply understands the customer and can translate that into product insight.”
Pedro on where machine learning is headed“The same basic paradigms have been used since the 1950s. At the end of the day, we’re going to need some new ideas.”
Ask about real life
My college roommate and I used to talk every day. Now it's been four months since she answered a text. I keep replaying our last conversation looking for what I said wrong
My ex lied to me for a year about a debt he'd hidden from me. I'm seeing someone new now, six months in, and he's done nothing wrong. But I still check his phone when he's in the shower and I hate who that makes me
I'm 14 months into paying off $30,000 of debt with $11,000 left. The excitement wore off around month four and now it's just spreadsheets and no going out. How do people keep going once the momentum's gone?
My chest gets tight and my hands go numb about twice a week, usually right before a meeting. My doctor ran an EKG and said my heart's fine. I keep wondering if this is just anxiety or something they missed
More on Delphi
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Top perspectives
Top perspectivesWriter of Lenny's Newsletter · Host of Lenny's Podcast · ex-Airbnb
“The honest answer: if you're not sure, you probably don't have it yet. When you truly have product-market fit, people are fighting to get in. You're not questioning it.”
Co-founder of Sundial · ex-VP Design at Facebook
“The clearest signal is retention: are the people who try your product coming back without you having to push them? If they are, you likely have product-market fit for a segment. If they aren't, the rest is noise.”
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Their Delphi, answering in their voice
I'm a solo founder and I honestly can't tell if I have product-market fit yet.
If you're not sure, you probably don't have it yet. When you do, people are fighting to get in. Start with the Sean Ellis “very disappointed” survey and look hard at retention. Those two give you the clearest read.
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