Working notes from product people

Ask the people who’ve done it.

A free, searchable library of 1,799 of the best product-management essays, podcast episodes and posts, from Lenny Rachitsky, Marty Cagan, Teresa Torres and seven others, that answers your questions with citations.

For PMs, founders and anyone building products

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Answers quote and cite the source notes

Unofficial · not affiliated with any author · every note links to the original

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Answers come from ten product leaders’ essays, podcasts and posts, not the open web.

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Each point carries a numbered citation that links to the note and to the original essay or episode.

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14 topics, from strategy to pricing to AI, and 33 common questions already answered.

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01 — Topics · the card catalogueBrowse by topic

Postfree essay or newsletter postPaidsubscriber post, summary onlyPodcastepisode with key learningsXpost on XHover a tag for the publication

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Open drawer · 01

Product strategy & vision

618 notes · 122 people · 2005–2026
The Looking Glass · Julie Zhuo♥ 40

What will make personal AI go big?

Sep 24, 2026
Subscriber post — summary only

Julie Zhuo reflects on Muse, a consumer AI agent she believes could actually change people's everyday habits. The essay, which is paywalled, argues that a few specific design choices explain why personal AI might…

@hnshah · Hiten Shah on X♥ 20
Your story is the operating system for your company. Everything runs on top of it. When the operating system is buggy, everything else slows down.
Lenny’s Podcast102 min

How we built Grok Bot in a month

Roman Ugarte · Sep 8, 2026
Key learnings
  • Build a new product from scratch with a small, isolated team rather than retrofitting an existing surface, so each micro-decision…
  • Onboard early users by hand and sit in on calls; fixing failures the same day compresses learning dramatically.
  • Let users reveal patterns on their own before productizing them, then gently encourage the winning patterns without making them…
SVPG · Marty CaganSep 11, 2026

Strong Opinions, Loosely Held

Sep 11, 2026 · 10 min

Marty Cagan revisits the foundational product-management ideas he publicly argued for over the past two decades and identifies ten significant mistakes or blind spots. He concludes that his earlier emphasis on…

@hnshah · Hiten Shah on X♥ 35
To the founder who can suddenly build almost anything Product marketing is about to matter a lot more. Software has become dramatically cheaper to make. A small team can ship in weeks what used to take a much larger team months. AI can help with research, design, code, support,

02 — FrameworksModels, annotated.

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03 — PeopleWho wrote the notes.

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04 — QuestionsAnswered from the notes.

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Where notes come from

NewsletterLenny’s Newsletter110 free posts, with a longer excerpt.
Subscriber postsSummary only233 paid posts: our summary, at most two short quotes, and a link.
PodcastLenny’s Podcast323 episodes, each with 5–8 key learnings and timestamps.
EssaysSVPG · The Beautiful Mess499 essays from Marty Cagan and John Cutler.
Substack & blogsShreyas · Julie · Jason · Hiten577 essays and posts from independent writers.
XPosts on product66 posts, filtered for product relevance.