Ask HN: What's the best book on entrepreneurship you've ever read?

What is the best book that you would recommend for someone who wants to start being an entrepreneur? Some background: I am doing some side projects already, but I want to approach a new one with a fresh perspective. I will have 2-3 months of unplanned time when I want to read more. So I am looking for recommendations about books that could help me create more fit for purpose projects.