Code to create navigation bar in website?

Here is the code to create a navigation bar:
 

 <nav class="navbar navbar-dark navbar-expand-sm bg-primary fixed-top">
<div class="container">
<a class="navbar-brand" href="#">Ristorante Con Fusion</a>
<ul class="navbar-nav mr-auto">
<li class="nav-item active"><a class="nav-link" href="#">Home</a></li>
<li class="nav-item"><a class="nav-link" href="./aboutus.html">About</a></li>
<li class="nav-item"><a class="nav-link" href="#">Menu</a></li>
<li class="nav-item"><a class="nav-link" href="#">Contact</a></li>
</ul> 
</div>
</nav>