A review of Andrew Ng´s talk at Y combinator, who shares lessons on building startups, particularly focusing on the rapid changes brought by Artificial Intelligence (AI). Ng, from AI Fund, emphasizes that execution speed is a strong predictor of startup success, which is now being greatly accelerated by new AI technology. He advises entrepreneurs to concentrate on concrete ideas, noting that the largest opportunities for new businesses exist at the application layer of the AI stack. Furthermore, he discusses the importance of agentic AI workflows for better results and explains how AI coding assistance is significantly reducing the time and cost of engineering, shifting the bottleneck to product management and user feedback. Ng concludes by advocating for widespread AI understanding, arguing that knowledge of AI buys speed and empowers people across all job roles.