What is a model?
To edit the resources you need to create a model and add fields, thanks to these two abstractions you can manage the inside of the back office. Let's go back to the blog example, the blog has posts (Posts) and the posts have a title and description (title, description).
Fields are divided into two categories: collection and form. The first are displayed on the page of the list of all records, the second when editing a specific record (or creating a new one)