A single model class usually maps to a single database table, and also relationships of different types (one-to-one, one-to-many, many-to-many, polymorphic) can be defined between different model classes.
Section Making a Model describes the creation and definition of model classes.
Before you can start using Eloquent models, make sure at least one database connection has been configured in your
config/database.php configuration file.
To understand usage of eloquent query builder during development you may use
php artisan ide-helper:generate command. Here is the link.