Where can I find laravel http test examples?

Question

Laravel

where can I see the methods of working with a get request,
I found it, but I don’t understand when it is appropriate to use them and what else are there?
$response->getContent()
$response->getBody()
and what is the first method why is it here 2 times?
$user = Aggregator::whereName('FSAggr')->first()->user()->first();