 When I renew material, sometimes I come across information I don't understand. Often I notice that my mind tends to gloss over sentences or paragraphs that don't make sense to me. As I notice that happening, I make a note of that, and I use the following tips to help me stay on track. I use the highlighter or draw a symbol next to the phrase that I like to return to later. If I'm reading on an electronic device, I'll note down the page number, paragraph, and a couple key phrases. When I'm finished reading, I go back to the material that I don't understand and come up with some questions to ask or paths to explore. I might ask my TA or professor to resolve my questions or take to the internet. Other sources can often fill in gaps of information and reinforce what I've already learned.