Whenever a website visitor views any page on your site, they trigger the page_view event. What if you wanted to define a new event to trigger when visitors land on a particular page (e.g., the homepage)? Once you’ve navigated to Events in the Google Analytics interface, which option would you choose to make this happen?
Explanation:
Use Create event to trigger a new event based on conditions that you set. Custom events are events that you define. Make sure you only create custom events when no other events work for your use case. Custom events don’t show up in most standard reports so you need to set up custom reports or explorations for meaningful analysis
Read more here: https://support.google.com/analytics/answer/9322688