In addition to whatever other markings and notes you make, here are four things to note:
- I like this. Make a note of something you thought was well-stated, clear, or encouraging.
- I want to know more. Note anything that inspires your curiosity or raises unanswered questions. Note topics that you would enjoy studying more deeply later or that you wish had been discussed in more detail.
- I do not understand. Note anything that confuses you or you think is not explained well.
- I disagree. Mark statements that cross you the wrong way, that you think are stated poorly, or that you believe are wrong.
As a sort of legend, you may want to write these in the front or back of your book and give each of them a number. When you underline something in the text, you can then write the number in margin rather than writing the whole phrase.
Enjoy your reading! I hope it stirs your imagination and strikes up your curiosity.