* To mark important information. This could include key facts, dates, or names.
* To identify main ideas or themes. Underlining or highlighting can help you to see the structure of a passage and to understand the author's main points.
* To make notes or comments. You can use underlining or highlighting to add your own annotations to a passage. This can help you to remember important information or to track your progress through a reading.
* To create a study guide. Underlining or highlighting can help you to create a study guide for an exam or presentation. By marking important information, you can make it easier to review and remember the material.
Ultimately, the best way to use underlining or highlighting is whatever works best for you. Some people prefer to underline only the most important information, while others prefer to highlight everything that they find of interest. Experiment with different techniques until you find the one that works best for you.