To use the example above on a blade template to hide content from the user, you would typically do something like this:
@can('view-content', $content)
<! -- content here -->
@endcan
To completely prevent navigation to the content, you can do the following in your controller:
if(Gate::allows('view-content', $content)){
/* user can view the content */
}
OR
if(Gate::denies('view-content', $content)){
/* user cannot view content */
}
Note: You are not required to pass the currently authenticated user to these method, Laravel takes care of that for you.