From early childhood, there are some idioms such as “Book is the window of the world” or “The key to conquering the world is by reading plenty of books”. Up until now, I still believe that this phrase is still relevant because with read a lot of books we can wider our knowledge. Throughout the digitalization era, books are being replaced by the internet, in this case with e-books that are stored in a cloud. While there are many discussions on this, I believe the benefits to use online-based books surpass the drawbacks.