Check out example codes for "nav html". It will help you in understanding the concepts better.

Code Example 1

<nav>
   <a href="/html/">HTML</a> |
  <a href="/css/">CSS</a> |
  <a href="/js/">JavaScript</a> |
  <a href="/python/">Python</a>
 </nav>

Code Example 2

<nav>

   <a href="/html/">HTML</a> |

  <a href="/css/">CSS</a> |

  <a href="/js/">JavaScript</a> |

  <a href="/jquery/">jQuery</a>

 </nav>

Code Example 3

<--for inserting a horizontal navigation in Css just make a 
list of navigation content links then in style tag add this tag -->
li {
  display: inline;
}

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