title: How do I create a subdirectory in html?
body: <p>For example, my website is mywebsite.com. On that site I have a page called "countries.html" with a list of countries on it. When a user clicks on the country (say Japan) it brings them to a page, "Japan.html".</p>
  
  <p>I want that Japan page to be under the countries page: mywebsite.com/countries/Japan.html. How do I create that subdirectory in HTML?</p>