title: adding new module in wordpress
body: <p>I'm sorry if my question is not good quality.I have problem when I want to understanding wordpress , I'm new in wordpress, and I want to create some module in wordpress, It's Possible?</p>
  
  <p>ex.</p>
  
  <ol>
  <li>if i want to add module, what must I'm studying in wordpress ?</li>
  </ol>