Do you underline it? "Dog-ear" that page? Highlight?
Creating #BookSnaps
Take a picture of the book page (home button and power button pushed at the same time)
Open in Photos app.
Click on the 3 horizontal lines or "the hamburger" (upper right hand corner)
Then click the circle with 3 dots (right side)
Choose the toolbox "markup" - your tools will show at the bottom.