Whenever entities are created, updated, or deleted, a set of hooks are fired that allow us to act on this information. We can use these hooks simply to perform some actions whenever this happens or even make changes to the entity being saved. So, let's see what we have.
A very useful one is hook_entity_presave(), which gets fired during the saving process of an entity (both content and configuration). This applies to both when the entity is first created, as well as when it is being updated. Moreover, it allows us to inspect the original entity and detect changes made to it. And finally, since the entity has not yet been persisted, it allows us to make changes to it ourselves. So very powerful stuff.
Since Drupal 8 is very ...
