Since, based on another post, you don’t appear to know much about evolution, I would suggest reading the following:
On the Origin of Species by Charles Darwin (the original, and still one of the best books on the topic)
Nearly anything by Richard Dawkins, especially The Selfish Gene, The Greatest Show on Earth, The Blind Watchmaker, Climbing Mt. Improbable, and The Ancestor’s Tale.
Why Evolution is True by Jerry Coyne