The benefit of using what is google question hub is that google have some question which users ask but even google doesn’t know the answer so google ask you to write the article for that unanswered question so once you select the website you have let us know if you have a shopping website and you select the spark product and you select the spark question once you answer the given question you copy the URL.
After that paste the URL link then the google will let you know how many people have gone through your article who have clicked on the link and how many people have visited your website this is the the organic way to bring traffic to your website by answering the question for google.