Store-POS | Point of Sale Desktop App built with Electron | Runtime Evironment library

You should change $category to $tag in the edit() method of the controller. When you write the class name next to variable in your controller, you're telling laravel to use its model binding functionality, and laravel need the exact name of the resource which is defined in the route to connect it to the correct model instance. Refer to this

You're using Route::resource('tag', ...), and it creates the route of Route::get('tag/edit/{tag}', ...) in it. So, you need to refer to tag exactly in your controller.