It’s Easier to Highlight or Comment on Digital Books
With digital books, you can highlight any quote or phrase in a book with just one finger.
Not only that, but it’s way easier to write a comment on a digital book instead of having to write on a white space you found.
After you’re done, most reading apps also come with a way for you to quickly access and find your comments and highlights. And you can even send them to yourself via email so you never lose them.