Where on an e-commerce website should an advertiser install the AdWords Conversion Tracking code?

  • Confirmation page after a purchase
  • Shopping cart header
  • Website homepage
  • Landing page of an ad

The correct answer is:

  • Confirmation page after a purchase

Explanation: To use conversion tracking, you’ll need to put a small snippet of HTML and JavaScript code on the page that customers see after they’ve completed a valuable action on your site. For example, you could add the code to your purchase confirmation page, which is the page people see after they’ve made a purchase.

You can read more here: https://support.google.com/adwords/answer/1722054?hl=en