return redirect()->back()->with('message', 'IT WORKS!');
Displaying message if it exists:
@if(session()->has('message')) <div class="alert alert-success"> {{ session()->get('message') }} </div>
@endif

return Redirect::back()->withErrors(['msg', 'The Message']);
and inside your view call this
@if($errors->any())
<h4>{{$errors->first()}}</h4>
@endif

Route::post('user/profile', function () { // Update the user's profile... return redirect('dashboard')->with('status', 'Profile updated!');
});

{{ url()->previous() }}

// For a route with the following URI: profile/{id}
return redirect()->route('profile', [$user]);

{{ url()->previous() }}

return redirect()->back();