When should and should not parentheses be used in relations?

Question

Laravel

For example, we have an association of authors with posts. You can write like this in laravel
$author->post()
and like this
$author->post
The documentation just says what can be a dynamic property.
Can someone clarify this point?

Answer 1

$author->post()
returns the query builder, so you can continue calling the query builder's methods, e.g.
And in the second case, you immediately get a model or a collection of models.