Book VS smartphone reading behavior

When you read a book the content is fixed here on the page and rhat’s your eyes and head which move to consume the text. When you you read on a smartphone the content can move or be fixed. With the smartphone the reading dynamics is not the same so you should know what the best option to make the readers at ease reading and what option fit better if neural activity. These are not obvious choice it helps to study them to know the best option.