You should learn a huge amount from your reading. If you read passively, without learning, you're wasting your time. So train your mind to learn.
Try the SQ3R technique. SQ3R stands for Survey, Question, Read, Recall and Review.

• Survey
  Gather the information you need to focus on the work and set goals:
  * Read the title to help prepare for the subject
  * Read the introduction or summary to see what the author thinks are the key points
  * Notice the boldface headings to see what the structure is
  * Notice any maps, graphs or charts. They are there for a purpose
  * Notice the reading aids, italics, bold face, questions at the end of the chapter. They are all there to help you understand and remember.

• Question
  Help your mind to engage and concentrate. Your mind is engaged in learning when it is actively looking for answers to questions.
  Try turning the boldface headings into questions you think the section should answer.

• Read
  Read the first section with your questions in mind. Look for the answers, and make up new questions if necessary.
  Recall
  After each section, stop and think back to your questions. See if you can answer them from memory. If not, take a look back at the text. Do this as often as you need to.

• Review
  Once you have finished the whole chapter, go back over all the questions from all the headings. See you if can still answer them. If not, look back and refresh your memory.

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