This book is about God's principles on receiving, how it blesses you but giving is what produces the blessing of supply for you to receive. This principle applies to all sowing and reaping - giving and receiving. We have to be very careful not to sow any bad seeds, like doing wrong things to our neighbors.
We will learn from this book that giving must be done in rhythm in order to really reap the harvest, like doing good deeds, giving tithes, giving to someone in need, praying for the sick, helping others. And that you will receive more than you give.
God doesn't need our money. It all belongs to Him. It's God's way of getting our needs met because he is our Source. We will learn that if we follow and obey God's plan there is to be an even greater prosperity. When you learn the truth about giving and receiving, it will make you free.