Guy Kawasaki's book The Art of Start 2.0 provides lessons from his experience as an entrepreneur and startup investor to help new entrepreneurs succeed. It discusses how to come up with a good idea, lead a team with a common vision, and grow the startup through evangelism, partnerships, and social media. Some key lessons include resisting the temptation to scale too quickly, telling meaningful stories to inspire faith in the product's vision, avoiding too much information or jargon, and keeping messaging simple. The book aims to prepare entrepreneurs for the startup journey with battle-tested knowledge.