I was the only person my cousin could turn to for help when he was taking math in high school. When he asked me for help, my first instinct was to help him find the relevant information in his textbook. But the textbook wasn't helpful at all. First, he was often working with things that weren't indexed; even though his homework was from the textbook's supplemental materials. Then, the text was hard to understand. It just wasn't written very well. Finally, the whole thing was just too busy, with many different fonts, all sorts of margin notes, many footnotes, and colored boxes surrounding text. This made finding information harder and just gave me a headache.