The Entity API is quite complex. We have only begun our journey to understanding the different kinds of entity types, bundles, fields, and so on. We have so far talked about the differences between configuration and content entity types and what exactly they are made up of. To this end, we also touched upon the different types of fields they can use and how the data in these fields is stored.

However, there is still a lot to understand about entities, especially content entities, which will be our focus in the next sections. We are going to first look at the TypedData API to better understand how content entity field data is modeled. As of now, that is still a black box; am I right? Next, we'll look at how to actually work with the API to query, create, and manipulate entities (both content and configuration). Finally, we'll talk a bit about the validation API the content entities and fields use consistently to ensure they hold proper data. So, let's get to it.