People (especially students) love to write in books, scribble in the margins, put sticky-notes on pages to flag them, use highlighter pens to call attention to important passages, draw circles and arrows to connect margin notes to text, and generally make a glorious mess of things as they attempt to comprehend the contents of their books.
As you already saw in The Markup Tools, PDFpen has an assortment of tools that you can use to perform similar actions on the contents of a PDF.
In this chapter, you’ll see how to take notes for a research paper by using these tools to mark up PDFs.
It is rare to find a student who doesn’t use a highlighter pen to mark up text. After all, highlights draw immediate attention ...