What’s the one startup book that actually changed how you build?

I once burned 3 months following advice from a book that should never have been written.

Brutal lesson.

I definitely did — chasing AI “Top 10” lists and unread stacks that never saved my startup.

That’s why I built The Founder’s Bookshelf — a curated shelf of 50 books trusted by the top 1% of founders.

But I’m curious about your scars:

👉 What’s the one book that actually made a difference for you as a founder?

(Dropping mine in the comments 👇)