$request->authenticate(); breezede . isteğin kimik bilgilerini dogruluyor. loginrequest.php
public function authenticate(): void
{
$this->ensureIsNotRateLimited();
if (! Auth::attempt($this->only('email', 'password'), $this->boolean('remember'))) {
RateLimiter::hit($this->throttleKey());
throw ValidationException::withMessages([
'email' => trans('auth.failed'),
]);
}
RateLimiter::clear($this->throttleKey());
}