How to study oracle books or any other books

First you get a intutive oracle book that you only have to read once or twice to understand the difficult concept, read my advice on what book to read. If not go to amazon and type best oracle book, read the reviews on the book. Go to google books to check review of the book. Use search engine type ""oracle book title xxxx" free book" you will usually find a copy of the book. Use search engine of singapore library to find the book. This will be your major oracle book.
Then if you have concept you dont understand in the major oracle book, read other oracle book that gives the explanation in a different way.
Then after you have masters the old master book, go find a more advance oracle book to be your master book.