The 4th in the series "How to start a startup" class given at Stanford. These are not professional speakers; more importantly they are people who have actually done startups. These lessons are well earned.
Here's the link to the video: https://www.youtube.com/watch?v=yP176MBG9Tk
And here's the link to the reading materials: http://startupclass.samaltman.com/lists/readings/