"Build" by Tony Fadell is important for entrepreneurs because it provides practical advice and real-world examples of how to build and scale successful products and companies. The book highlights the importance of starting with a clear vision and mission, building a strong team, focusing on user experience and design, and continuously iterating and improving.

Here are some of the key takeaways from Tony Fadell's "Building":

• Building something great requires a deep understanding of the user, their needs, and their pain points.

One example of this is the development of the iPod, which Fadell helped create at Apple. Fadell and his team spent a lot of time understanding the needs and desires of music listeners, such as the desire for a portable device that could store and play thousands of songs. By understanding these needs, Fadell and his team were able to create a product that revolutionized the music industry.

• Quality and attention to detail are critical to building something that lasts.

Fadell emphasizes the importance of quality and attention to detail throughout the book. For example, he talks about how Apple's obsession with quality and attention to detail played a crucial role in the company's success. Fadell also discusses how he applied these principles to his own startup, Nest, which was acquired by Google in 2014 for $3.2 billion.

• Innovation comes from bringing together a diverse group of people with different perspectives and experiences.

Fadell believes that diversity is essential to innovation. He talks about how he intentionally hired people with different backgrounds and experiences at Nest, which helped the company develop innovative products. For example, Nest's smart thermostat was designed by a team that included engineers, industrial designers, and even a former Pixar animator.

• Building something great takes time, effort, and perseverance.

Fadell acknowledges that building something great is not easy. He talks about the challenges he faced when developing the iPod, as well as the setbacks and failures he experienced while building Nest. However, he emphasizes that perseverance is essential to success. He also stresses the importance of taking the time to get things right, rather than rushing to meet a deadline.

• Building something great is about making a difference in people's lives.

Throughout the book, Fadell emphasizes the importance of creating products that make a difference in people's lives. For example, he talks about how Nest's smart thermostat helped people save energy and money, while also being more comfortable in their homes. Fadell also discusses the importance of creating products that are not only functional, but also emotionally resonant with users.

Here are some quotes from Tony Fadell's book "Build" that might be of interest:

1. "Building something great is really figuring out what the next big thing is going to be and then having the guts to take a risk on it."

2. "The best products come from a deep understanding of the user, their needs, their desires, their pain points."

3. "One of the key ingredients to building something great is having a team that is aligned around a common vision and mission."

4. "Design is not just how something looks and feels, it's also how it works and how it fits into people's lives."

5. "If you want to build something that lasts, you have to build it with quality and attention to detail from the very beginning."

6. "Innovation doesn't happen in a vacuum. It happens when you bring together a diverse group of people with different perspectives and experiences."

7. "Building something great takes time, effort, and perseverance. You have to be willing to iterate, to try new things, and to keep pushing forward even when things get tough."

8. "Success is not just about the final product, it's also about the journey. You have to enjoy the process and the people you're working with along the way."

9. "Building something great is not just about the idea, it's also about the execution. You have to have a plan, a strategy, and the resources to make it happen."

10. "At the end of the day, building something great is about making a difference in people's lives. It's about creating something that solves a problem or makes their lives better in some way."