Take Screenshot and Draw On It
You can take a screenshot on the iPhone 8 by pressing the power button and the home button at the same time. Once you take this, tap on the screenshot in the lower left corner to open it.
On this screen you can choose from a three writing tools, an eraser, a lasso to make selections and you can also crop the screenshot. Tap the plus sign to add text, a signature, a magnifier or specific shapes like a box, circle, speech bubble or an arrow.
This is really handy for showing someone where to tap, or for calling out a specific spot on a map or document.