The most important thing about you is that you are alive. To understand yourself, you have to understand living things. One of the most fundamental things to know about living things is that they are designed to pass on their genes. All the things they do have this end goal in mind. You, dear reader, being made for The Sweet Spot, that time and place many thousands of years ago are also driven by this end goal.
Genes that are the unit of replication. Genes created living things in order to make more copies of themselves. Genes that makes copies of themselves stick around and those that do not, die off. The measure of this success or failure is called the Genetic Proliferation Rate, or GPR for short.
All plants and animals, and you and your friends, are designed and motivated to get your genes the highest collective GPR possible.