> FaunaDB a perfect choice for developers who don’t know much about databases

And, from the Fauna docs:

> Related documents in FaunaDB are stored within classes (also known as collections), which are similar to tables in relational databases, except that the different items in the class are not all required to have the same fields. Typically, classes correspond to types in your application, for example, blog posts, authors, comments, shopping carts, line items, and invoices. Creating a class is easy as you don’t have to specify constraints or field names.

As someone who's dealing with a long-lived Mongo application, this "you don't have to think/know anything about databases to get started!" thing might start off as a feature, but it'll turn into an anchor.