You can use this guide to learn how to use ad extensions for Google Adwords.
You can boost performance of your Google ads without increasing your marketing budget. They’re easy to set-up and they’re displayed beside your pay-per-click ad at no additional cost.
Most marketers are not sure which ad extensions to use. This guide can help you decide which ones will work best for your search marketing campaigns.
Want more help with your pay-per-click advertising? Check out this Google Adwords tutorial.
The Complete Guide to Google Adwords Ad Extensions