Conventions Used in This Book

This book uses different typefaces to differentiate between code and regular English, and also to help you identify important concepts.

Text that you type and text that should appear on your screen is presented in monospace type.

 It will look like this to mimic the way text looks on your screen. 

Placeholders for variables and expressions appear in monospace italic font. You should replace the placeholder with the specific value it represents.

A Note presents interesting pieces of information related to the surrounding discussion.

A Tip offers advice or teaches an easier way to do something.

A Caution advises you about potential problems and helps you steer clear of disaster.