The Path exploration technique lets you understand the different ways users traversed your content, and the different metrics they generated along the way. You can start a path exploration with either a screen or an event.
For example, if you start with the page users land on after clicking the add for your summer sale, you can see how many page_view events are subsequently triggered for the individual product pages, and then for the pages in your checkout sequence.
Or you could start with the session_start event, and then see the next actions users took: for example, were there more app_update or app_remove events? If users were updating the app, did they go on to trigger level_up and post_score events?