Simplify everything and make it short, like the lecture notes. Some lecturers can talk about 30-45 minutes ,
just for 1-2 slides. and these 1-2 slides maybe only contains 5-10 points or less than 50 words.
Here , you can see, when the whole page was being highlight, it means it is a note, but it can be a book too .
Actually they are all from the book, but we make it into slides. A psychological strategy so that students READ !