You may prefer to make notes on index cards. These are sometimes referred to as summary cards or concept cards as they are often used to summarise the information you have collected on a certain topic. Or you can use them to note relevant keywords with brief explanations.
This example describes the kind of information you might include on your index card.
Front of card
This side includes information such as the date, page from the text and the subject of the notes - attachment relations - with a very brief précis of the subject.
Back of card
On the reverse the card is used to list important notes for the subject. The notes are linear and broken down into sections by lines and headings.