Goals in Google Analytics allow you to measure how often users complete specific actions, like form submissions, product purchases, ebook downloads, and more.
When a website visitor performs the specific action that you've defined as a goal, Google Analytics records that as a conversion.
You can create four different goal types in Google Analytics:
- Destination: You can choose this goal type if you want to treat a pageview or screen view as a conversion.
- Duration: You can measure user engagement by treating time spent on a page as a conversion.
- Pages/Screens per session: This is another way to measure user engagement. You can measure the number of page views per session as a conversion.
- Event: You can treat user interaction like button click, video play, ebook download as a conversion.
Source: https://www.monsterinsights.com/the-complete-beginners-guide-to-google-analytics-for-wordpress/