Determine your purpose for highlighting. What do you want to get out of highlighting the text? Are you looking to remember important information, or are you trying to identify key points for discussion or further research? Knowing your purpose will help you focus your highlighting and make sure that you're getting the most out of it.
Use a consistent highlighting system. This will help you stay organized and make it easier to find the information you've highlighted later on. For example, you might use different colors to highlight different types of information, or you might use symbols or abbreviations to indicate key points.
Don't overdo it. It's tempting to highlight everything that seems important, but this can actually make it more difficult to find the information you need later on. Be selective and only highlight the most important points and information.