For me, typesetting my handwritten notes was part of the learning process. Usually one textbook is not enough for me, I always reference multiple sources (text

For me, typesetting my handwritten notes was part of the learning process. Usually one textbook is not enough for me, I always reference multiple sources (textbook, lecture notes, blog posts, homework problems) when learning so it's helpful to put a condensed version of everything in one place. Textbooks usually have a lot of fluff. My personal notes are also really helpful as reference material later -- three months from now I probably won't remember anything that I read today.