I don't recommend this book. Sometimes I even don't understand the author's English to begin with.
I first read the chapter on Recurrent Neural Network but the explanation is pretty limited and it just touches on any concept vaguely. You must investigate how it works, which no longer makes this book valuable as a learning book.
And the author just shows the code without going into greater details, especially on the introduction to Keras.
The overall, I get it only 1 star. Pretty disappointed.