The author had an invaluable experience, but I think the blog post doesn't do it justice. None of the section headings is actually that surprising; it's unlikely he started a business without being aware of all those lessons in the broad strokes. Be ruthless, yes, but why was he unable to be ruthless even when he knew he should be? "Fail fast"? What did he do that violated that? What was he thinking, failing slowly?

I wish he could come up with a way to give us more concrete details that add nuance to the broad lessons. Memories will fade, and if all he's saved of them is this blog post, the lessons will follow the life savings. And that would be tragic.