Depending on the reader's preferred ways of reading/studying, productive reading strategies can vary slightly. I like to use these, personally:
1. Skim the writing first, then go back and re read it slowly.
2. Take notes on things that are interesting, inspiring personally, motivating, and/or things that raise questions. Especially those!
3. Afterwards, go back with your notes and the reading and make connections, try and decide what this means or what that means, try and answer some of your own questions, maybe write more.
These are just what I like to use... I find the notes are especially helpful when trying to write a response to a reading, or wanting questions answered.