"Thus Spoke Zarathustra" is one of the masterpieces of the famous German philosopher Nietzsche. It is a book called a "philosophical novel". This book was written between 1883 and 1885. It was in this book that Nietzsche wrote: "God is dead!" And at the same time said that he was studying the "science of happiness."
"Beyond Good and Evil" is a more focused and continuation of the thoughts of "Thus Spoke Zarathustra", but the thoughts are sharper and the vision is wiser. They can be said to be companion volumes. Therefore, it is a very good idea to publish them two volumes into one. Moreover, this can provide readers with more of Nietzsche's ideological content at a relatively low price.
This English translation is the most authoritative version recognized by Nietzsche himself.