The Millionaire Real Estate Investor" by Gary Keller is a comprehensive guide to building wealth through real estate investing. The book is divided into three parts: "The Mindset of a Millionaire Real Estate Investor," "The Mechanics of a Millionaire Real Estate Investor," and "The Millionaire Real Estate Investor in Action."

Part One: The Mindset of a Millionaire Real Estate Investor

In this section, Keller lays out the foundation for success in real estate investing. He explains that the key to becoming a millionaire real estate investor is to think like one, and that this mindset is built on four pillars: knowledge, discipline, action, and patience.

One of the most important points in this section is the idea that knowledge is the foundation of success in real estate investing. Keller argues that investors must educate themselves about the market, the properties they are considering, and the legal and financial aspects of the investment. He also stresses the importance of discipline, both in terms of staying focused on one's goals and sticking to a plan.

Another important point in this section is the idea that action is essential to success. Keller emphasizes that investors must take action in order to make things happen and that it's not enough to simply have knowledge and discipline. He also stresses the importance of patience in real estate investing, noting that it can take time for investments to pay off, but that the rewards can be significant.

Part Two: The Mechanics of a Millionaire Real Estate Investor

In this section, Keller delves into the mechanics of real estate investing, including finding and evaluating properties, financing options, and managing and growing a portfolio.

One of the most important points in this section is the idea that investors must be able to identify properties with the potential for significant appreciation. Keller explains that this requires understanding the market and the factors that drive property values, as well as being able to evaluate properties based on their income-producing potential and other factors.

Another important point in this section is the idea that investors must be able to access the financing they need to make investments. Keller explains the various financing options available to real estate investors, including conventional mortgages, creative financing, and private lending. He also stresses the importance of having a solid credit history and being able to demonstrate a track record of successful investments.

Part Three: The Millionaire Real Estate Investor in Action

In this final section, Keller provides real-world examples of successful real estate investors and the strategies they used to achieve success. He also provides a step-by-step plan for creating and managing a portfolio of rental properties.

One of the most important points in this section is the idea that real estate investing is a long-term strategy. Keller emphasizes the importance of creating a diversified portfolio that includes a mix of properties, and of being patient and disciplined in managing that portfolio.

Another important point in this section is the importance of having a clear plan and sticking to it. Keller explains that investors must have a clear vision of what they want to achieve, and must be willing to work hard and be patient in order to make that vision a reality.

"The Millionaire Real Estate Investor" is a great guide for anyone interested in building wealth through real estate investing. It provides a wealth of information and practical advice on every aspect of the process, from finding and evaluating properties to managing and growing a portfolio. Whether you're a seasoned investor or just starting out, this book is a must-read for anyone interested in achieving financial freedom through real estate.