title: How to display WordPress Categories on front page
body: <p>Given are 5 categories &amp; their sub-categories in my WordPress Website. Sub-categories contains posts. I want to display categories (Only categories) on my front page. When a user click on any category, I want to show it's all sub-categories on another page and when user click on any sub-category, I want to display all the posts that category contains.</p>
  
  <p>Please tell me how to do it? I have studied WordPress category guides but did not get any clue.</p>